Through Faith !
Eph 2:8
8 For by grace are ye saved through faith; and that not of yourselves: it is the gift of God:
The difference in saved on account of Faith and by means of Faith, it is this, our God given Faith in New Birth is the means by which the Holy Spirit uses for an application of the Knowledge of ones Salvation Lk 1:77
77 To give knowledge of salvation unto his people by the remission of their sins,
That Salvation comes through having their sins forgiven, which is by and through the Blood of Christ Eph 1:7
7 In whom we have redemption through his blood, the forgiveness of sins, according to the riches of his grace;
John the Baptist knew about this because He knew that Christ was that Lamb of God Jn 1:29 that taketh away the sin of the world[of God's People], which is another way of saying remission of sins, and so Faith is given to those who have had their sins remitted that they come to know of it spiritually !
Faith is an instrument of means to convey spiritual Knowledge ! Thats because Spiritual Knowledge cannot be conveyed to the mind of the flesh, which is enmity against God Rom 8:7
7 Because the carnal mind is enmity against God: for it is not subject to the law of God, neither indeed can be.
And it can only mind the things of the flesh Rom 8:5
5 For they that are after the flesh do mind the things of the flesh; but they that are after the Spirit the things of the Spirit. 5
