"Ray, you said earlier that no amount of discussion could make you change your mind ('Those who are converted by God cannot be talked out of their faith'). That suggests that no matter how much evidence or reason is presented to you, you will never even consider that you are wrong that the only way to heaven is to believe what you believe, rather than any good works. I think my beliefs, when I was a Christian, were more in line with what Galileo. 'I do not feel obliged to believe that the same God who has endowed us with sense, reason, and intellect has intended us to forgo their use.'" Leonie Trent
As an atheist, you have convictions (that can change with time or if you are exposed to extra knowledge). As a Christian I don't have mere convictions. I know the Lord (as does every genuine Christian). We can't un-know Him. You quoted my words when I said that we were "converted by God." It is God who reveals Himself through the new birth of John 3.
Again, He reveals Himself, personally. This doesn't mean that we hear voices or see visions. He transforms us on the inside, making us completely new people (that's why it's called the new birth). We then speak to Him through prayer, He speaks to us through His Word, and we trust Him implicitly (see John 14:21). You said of yourself "When I was a Christian," but theologically speaking (because you fell away) Scripture makes it clear that you had a false conversion (see Luke 9:62). I'm sure you would agree that you didn't know God, because to maintain you did flies in the face of your atheist convictions. If you can stand the sound of my voice, how about you listen to "True and False Conversion" on www.livingwaters.com and get back to me with your thoughts. Btw. God bless Galileo for not buckling to the scientific blindness of the Catholic church. I agree with his words completely.