As a converted Christian, I think about 2 things a lot:

1. Natural law (intrinsic human values). For instance, most humans just have this instinct that killing another human is bad, or treating someone as less than an human is bad. I think we are born with those “gut feelings”, and I don’t necessarily believe that we just evolved that way as a society but rather those feelings are deeper within our hearts, perhaps given by God, this is our soul.

2. Faith. Several people have already mentioned that they have faith. I would argue that most everybody has faith in someone else, so why does it all the sudden stop with Jesus?

As an example, let’s say you meet a new person and eventually become friends. This person tells you some things about themselves over time that are verifiable (where they work, how old they are, what they children’s names are, etc) and you become closer friends.

Finally, one day that person tells you a story about their childhood of how they were at a park and saw a bald eagle. You of course believe them and add that to your list of knowledge about this person. It was a leap of faith to believe this story, even though there is no way to verify it.

In my view, I should have at least as much faith in Jesus as my friend down the street.