Well, I’m not officially a member of the Church yet but I consider myself Catholic because:
#1- I found that I believed in God and Jesus Christ.
#2- I also believe 100% of what is in the Nicene Creed.
I also believe that the Catholic Church is (as stated in the Creed), the true version of the Church as passed down from the Apostles. I don’t know that Catholism is the only church accepted by God but I do think that it was the church that Jesus had envisioned and started.
Not to mention that most other Christian Churches seem vary fragmented and disorganized which doesn’t jive with me either from a personality standpoint.
I guess what it comes down to for me is that once I found faith, I decided that the best church was the one I felt was started by Jesus and carried on by Apostles. People may argue that it isn’t true but the bible seems to make it pretty clear, IMO (and some pretty great scholars). But in the end, I also just really like the Church I go to as well.