The only means of salvation is by confession of who Jesus is, according to John 8:24. Holiness is also necessary because Gods (Jesus and Father, John 17:11,22) are holy.
When we come to comply 100% with Jesus asks us to do to be eligible for Hs grace we are left with the principle roadblock for salvation, which is believing and confessing that Jesus is I AM, that is, YAHWEH according to Exodus 3:13-15.
John 8:24 ASV
I said therefore unto you, that ye shall die in your sins: for except ye believe that I am he, ye shall die in your sins.