Need help in constant argument with Christian friend

Hello! I need some help in dealing with an issue I've been coming across recently. I have a coworker/friend who is a Christian and ever since he learned i was pagan has been set on trying to figure out the "why." Why am I pagan, why do I chose to believe in God's that even in our own texts committed atrocities, why do I believe in a religion founded on the ideologies of a barbaristic society, why believe in an afterlife that is subjective on where you go based off of your previous actions, the list goes on. One of his main arguments he likes to throw in my face is that there is no archeological or historical evidence that our gods ever existed. Which even after reading what I have (which I'm finding out is not reliable sources), I cannot accurately say with confidence that in incorrect.

After what seems like months of on and off discussion and back and forth, my final conclusion was "I don't know." And I think this answer was mainly a cop-out because I was tired of consistently defending myself, because I enjoy the belief of the old gods and it makes me feel something more that what I did than when I was a Christian. Which if I say this leads to comments like "Well your gods are wroth and vengeful and commit immoral acts and blah blah blah." Or "but wouldn't you like to have a secure afterlife knowing that you are going to the good place just for your faith in the one true god alone?"

Anyways, as a young and growing pagan I would like to know some of your all's arguments and reasonings for your conversion and/or continues belief in the old traditions and the old gods, because I am running out. What could I cay to this person to potentially get the point across, which I know someday feels like beating your head off a brick wall and expecting it to fall down.

Thanks!