I'll never fully understand why believers feel the need to defend the existence of God. I know God exists, and my human inability to prove his existence amounts to basically nothing. If more Christians were worried about their own walk with God, and less about arguing with atheists, we'd all be better off. Of all the conversions I've seen, including my own, not one came about because a Christian had a convincing argument.
It's ok to be educated.
I am not so concerned about arguing with atheists. Perhaps to give them food for thought is not such a bad thing, no?
After all what was the point of Christ coming to earth if not to convert? Isn't that what we are called to do? Remember the parable of those who hid their light under the basket? What good is the light if you keep it hidden?
Blessings to you.