You should probably read Eph 2:8,9 again so you see what it REALLY says.Eph 2:8 indicates that that salvation by faith is the gift
How is it you resisted God's call according to your own testimony if God effectually caused you to believe
Belief doesn't mean SPIT - the devil BELIEVES, and so do his demons.
It's COMMITMENT in FAITH that matters. Every time I was convicted of my SIN, I loved my OWN WAY better than HIS. And I found that the "Conviction of sin" would fade away if I ran from it.