... Not one, for instance 1st Century Christians, ...
		
		
	 
Roman Catholicism, always appealing to the (so-called) 'church fathers' (all whom disagreed with one another, Augustine an heretic, Aquinas refuting him, Origen a known gnostic mystic, etc, etc) and never really truly relying upon the word of God...
Let no man deceive you by any means: for [that day shall not come], except there come a falling away [αποστασιαG646 N-NSF; apostasia] first, and that man of sin be revealed, the son of perdition; - 2 Thessalonians 2:3
Act 20:28-30 KJV - [28] Take heed therefore unto yourselves, and to all the flock, over the which the Holy Ghost hath made you overseers, to feed the church of God, which he hath purchased with his own blood. [29] For I know this, that after my departing shall grievous wolves enter in among you, not sparing the flock. [30] Also of your own selves shall men arise, speaking perverse things, to draw away disciples after them.
2Co 11:13-15 KJV - [13] For such [are] false apostles, deceitful workers, transforming themselves into the apostles of Christ. [14] And no marvel; for Satan himself is transformed into an angel of light. [15] Therefore [it is] no great thing if his ministers also be transformed as the ministers of righteousness; whose end shall be according to their works.
2Th 2:1-14 KJV - [1] Now we beseech you, brethren, by the coming of our Lord Jesus Christ, and [by] our gathering together unto him, [2] That ye be not soon shaken in mind, or be troubled, neither by spirit, nor by word, nor by letter as from us, as that the day of Christ is at hand. [3] Let no man deceive you by any means: for [that day shall not come], except there come a falling away [Apostasy] first, and that man of sin be revealed, the son of perdition; [4] Who opposeth and exalteth himself above all that is called God, or that is worshipped; so that he as God sitteth in the temple of God, shewing himself that he is God. [5] Remember ye not, that, when I was yet with you, I told you these things? [6] And now ye know what withholdeth that he might be revealed in his time. [7] For the mystery of iniquity doth already work: only he who now letteth [will let], until he be taken out of the way. [8] And then shall that Wicked be revealed, whom the Lord shall consume with the spirit of his mouth, and shall destroy with the brightness of his coming: [9] [Even him], whose coming is after the working of Satan with all power and signs and lying wonders, [10] And with all deceivableness of unrighteousness in them that perish; because they received not the love of the truth, that they might be saved. [11] And for this cause God shall send them strong delusion, that they should believe a lie: [12] That they all might be dammned who believed not the truth, but had pleasure in unrighteousness. [13] But we are bound to give thanks alway to God for you, brethren beloved of the Lord, because God hath from the beginning chosen you to salvation through sanctification of the Spirit and belief of the truth: [14] Whereunto he called you by our gospel, to the obtaining of the glory of our Lord Jesus Christ.
1Ti 4:1-2 KJV - [1] Now the Spirit speaketh expressly, that in the latter times some shall depart from the faith, giving heed to seducing spirits, and doctrines of devils; [2] Speaking lies in hypocrisy; having their conscience seared with a hot iron;
2Ti 3:1-8 KJV - [1] This know also, that in the last days perilous times shall come. [2] For men shall be lovers of their own selves, covetous, boasters, proud, blasphemers, disobedient to parents, unthankful, unholy, [3] Without natural affection, trucebreakers, false accusers, incontinent, fierce, despisers of those that are good, [4] Traitors, heady, highminded, lovers of pleasures more than lovers of God; [5] Having a form of godliness, but denying the power thereof: from such turn away. [6] For of this sort are they which creep into houses, and lead captive silly women laden with sins, led away with divers lusts, [7] Ever learning, and never able to come to the knowledge of the truth. [8] Now as Jannes and Jambres withstood Moses, so do these also resist the truth: men of corrupt minds, reprobate concerning the faith.
2 Peter 3:16 KJV - [16] As also in all his epistles, speaking in them of these things; in which are some things hard to be understood, which they that are unlearned and unstable wrest, as they do also the other scriptures, unto their own destruction.
Rev 2:20-23 KJV - [20] Notwithstanding I have a few things against thee, because thou sufferest that woman Jezebel, which calleth herself a prophetess, to teach and to seduce my servants to commit fornication, and to eat things sacrificed unto idols. [21] And I gave her space to repent of her fornication; and she repented not. [22] Behold, I will cast her into a bed, and them that commit adultery with her into great tribulation, except they repent of their deeds. [23] And I will kill her children with death; and all the churches shall know that I am he which searcheth the reins and hearts: and I will give unto every one of you according to your works.
Rev 17:1-6 KJV - [1] And there came one of the seven angels which had the seven vials, and talked with me, saying unto me, Come hither; I will shew unto thee the judgment of the great whore that sitteth upon many waters: [2] With whom the kings of the earth have committed fornication, and the inhabitants of the earth have been made drunk with the wine of her fornication. [3] So he carried me away in the spirit into the wilderness: and I saw a woman sit upon a scarlet coloured beast, full of names of blasphemy, having seven heads and ten horns. [4] And the woman was arrayed in purple and scarlet colour, and decked with gold and precious stones and pearls, having a golden cup in her hand full of abominations and filthiness of her fornication: [5] And upon her forehead [was] a name written, MYSTERY, BABYLON THE GREAT, THE MOTHER OF HARLOTS AND ABOMINATIONS OF THE EARTH. [6] And I saw the woman drunken with the blood of the saints, and with the blood of the martyrs of Jesus: and when I saw her, I wondered with great admiration.
	
		
	
	
		
		
			... actually not any Christian until a protesting against God's Church in the 16TH Century ...
		
		
	 
Please know your history a little better, for "reformation" was desired long before brothers Tyndale, or Martin Luther, or Erasmus, or Huss, or Jerome, or even Wycliffe...
I protest by your rejoicing which I have in Christ Jesus our Lord, I die daily. - 1 Corinthians 15:31
God Himself through His prophets had from the beginning:
For I earnestly protested unto your fathers in the day [that] I brought them up out of the land of Egypt, [even] unto this day, rising early and protesting, saying, Obey my voice. - Jeremiah 11:7
Now therefore hearken unto their voice: howbeit yet protest solemnly unto them, and shew them the manner of the king that shall reign over them. - 1 Samuel 8:9
And the king sent and called for Shimei, and said unto him, Did I not make thee to swear by the LORD, and protested unto thee, saying, Know for a certain, on the day thou goest out, and walkest abroad any whither, that thou shalt surely die? and thou saidst unto me, The word [that] I have heard [is] good. - 1 Kings 2:42
Yet the LORD testified against Israel, and against Judah, by all the prophets, [and by] all the seers, saying, Turn ye from your evil ways, and keep my commandments [and] my statutes, according to all the law which I commanded your fathers, and which I sent to you by my servants the prophets. - 2 Kings 17:13
And the angel of the LORD protested unto Joshua, saying, - Zechariah 3:6
etc, etc.
Protestantism against error and 
sin [1 John 3:4; Exodus 20:1-17] is Scriptural.  Apostasy and sin is rebellion toward the Highest Rule.
	
		
	
	
		
		
			... believed in a sola Scriptura man-made concept for our Salvation.
		
		
	 
I think you may have a misunderstanding of Sola Scriptura, for it includes therein more than the words in Scripture, it also includes words of the Apostles/Prophets sent [which were to always be in harmony with what went before, in direct atonement with the Ten Commandments], and Creation itself [the other general 'book' of God, nature].
I will worship toward thy holy temple, and praise thy name for thy lovingkindness and for thy truth: for thou hast magnified thy word above all thy name. - Psalm 138:2
To the law and to the testimony: if they speak not according to this word, [it is] because [there is] no light in them. - Isaiah 8:20
NUN. Thy word [is] a lamp unto my feet, and a light unto my path. - Psalm 119:105