Well, there has been no response to Galations 1... Go figure!
How about this scripture:
Hebrews 6:4 It is impossible for those who have once been enlightened, who have tasted the heavenly gift, who have shared in the Holy Spirit, 5 who have tasted the goodness of the word of God and the powers of the coming age, 6 if they fall away, to be brought back to repentance, because to their loss they are crucifying the Son of God all over again and subjecting him to public disgrace. 7 Land that drinks in the rain often falling on it and that produces a crop useful to those for whom it is farmed receives the blessing of God. 8 But land that produces thorns and thistles is worthless and is in danger of being cursed. In the end it will be burned. 9 Even though we speak like this, dear friends, we are confident of better things in your case--things that accompany salvation.
If the writer of Hebrews identifies the possibility of "falling away", then that's good enough for me. You can believe what you want, I will choose to believe the Bible.