Jesus and the cross are a great start, that is where the church comes from. Inevitably you might have to deal with “maybe he was a real person, but how do you know he isn’t a quack”. This is where witness and testimony are important. What kept me, personally from going off the deep end was St. Paul. Think about it, here you have a rising star, someone who has everything. And what, he gives up everything for what? Persecution? Imprisonment? Death? That hardly makes sense, and if you read him he was lucid. And what of the 12 apostles who saw him rise? Why would they make this claim and keep it, even unto death. This is quite unique in history.
It’s actually far more rational to believe Christ was the Word made flesh. So why Catholic then? History is a good start there. What did the early believers die for, specifically the ones who didn’t write the bible. What did the every day believer die for. It wasn’t for the baptist, or any Protestant church.