You can't explain the Roman Centurion's faith, of whom Jesus said he had greater faith than any one else in Israel. You have never answered those arguments, and probably never will.
Never assume.
You take for granted that which is yet to be proved: i.e. the faith of the Centurion originated with the Centurion.
Had there been no other Scriptures to prove your assumption errant, we should all honor and revere this Centurion, as do you, as the exemplary role model of man-created faith to which we should all strive to attain.
In fact, there should be churches erected in his name: ‘Blessed Centurion Church of the Most Holy Faith.’
But alas, we have much Scriptures which disprove your assumption.
Of course, we realize no matter how many Scriptural proofs to the contrary, your will is unbendable, incapable of surrender.
Thus, this exercise is really for those whose wills are still pliable and whose minds are not permanently shut.
The Disciples were all of Israel. Did our Lord dismiss their faith as subservient to that of the Centurion?
In fact, Jesus was quite explicit in explaining the origin of their faith:
It is given unto you to know the mysteries of the kingdom of heaven, but to them it is not given. (Matt. 13:11)
The giver of spiritual knowledge is God, as is the faith to believe that knowledge.
God gave the Centurion something which He does not give all men: faith in Christ.
The Centurion came to Jesus, humbly, in faith.
Who or what caused the Centurion to come?
No man can come to me, except the Father which hath sent me draw him. (John 6:44)
According to Jesus it was the Father who drew the Centurion to him in faith.
Jesus explained how it was the professional religionists remained in unbelief while the unschooled believed.
The Centurion was a Gentile, not raised in a religious Jewish household, unschooled in the Jewish faith, a babe.
O Father, Lord of heaven and earth, because thou hast hid these things from the wise and prudent, and hast revealed them unto babes.
26 Even so, Father: for so it seemed good in thy sight. (Matt. 11:25-26)
It is the Father who reveals Christ to whom He will.
It is Father who hides Christ from whom He will.
It was the eternal will and purpose of the Father to reveal Himself in Christ to that Centurion.
Just as it is the eternal will and purpose of God to reveal Himself in Christ to all His Elect.
He saith unto them, But whom say ye that I am?
16 And Simon Peter answered and said, Thou art the Christ, the Son of the living God.
17 And Jesus answered and said unto him, Blessed art thou, Simon Barjona: for flesh and blood hath not revealed it unto thee, but my Father which is in heaven. (Matt. 16:15-17)
It pleased the Father to reveal Jesus to Peter, to His Disciples, to the woman issuing blood, etc., as it now pleases God to reveal Jesus to spiritual Israel, consisting of the Jewish and Gentile Elect....Centurions included.