I have always reduced the discussion to two points.

First, science generally supports the idea of a "creator". Not believing in a Creator requires far more "faith" than believing in one for reasons related to physics. At the end of the day, the atheists defaults to what religious people attribute to a creator to some other principle of physics that has yet to be discovered. Talk about "faith".

The second point is whether "the Creator" takes any interest in the "creation" or even more precisely individuals. This is where science ends and faith steps in for the religious.

There simply is no way to persuade someone that God cares, as a Christian I believe only the Holy Spirit can "convict" you of that. Point to the cross and blood sacrifice of Jesus and the atheist will argue the Romans executed lots of people by crucifixion. I could go on, but you get the point.

I believe in God (that was pretty easy), but it took a sense of the Holy Spirit for me to accept Jesus as God's son. So, I am sympathetic to those who feel the Holy Spirit has not reached out to them I was "them" once.

Is it possible God reaches people in ways other than through the ways Christians point to... sure. It is possible. With God, anything is possible. But why risk wandering in the desert, when God has given you a roadmap?