Although can't speak to other faiths as I'm not an expert, Christianity is different because of who God is and its platform. That is to say the Jesus content aims to improve the human condition - moral support, the meaning of life, right and wrong and motivations to implement what becomes important. I advocate that spending time with this can get you answers and better arm you to take action on the answers you find.
In the end, Christianity may not deliver any of these benefits. It doesn't appear to for Kepler. But for many, faith is very beneficial - many it helps directly and many more indirectly via others. It comes down to who you are. People are radically different based on politics, pacifism, personality types and the like. Christianity or other faiths may benefit one or it may not - much of it comes down to who you are.
But as with marriage, it also depends on the fit. That is to say some doctrine may not make sense to you. And that's OK. For example, some believe the Bible is literal and the OT is of equal weight to the NT. I believe that Jesus trumps the OT - Jesus was God, He was well documented and He came late and could set the record straight. Some skeptics would tell you I'm 'wrong' or 'cheating' because I don't adhere to the God in which they disbelieve. That doesn't matter. What is important is finding the right community that aligns with your POV (i.e., NT vs. OT)...because community is a big source of the above benefits.
Find a community and spends some time with this stuff. If it improves things, do more. Maybe you'll call yourself a Christian...maybe not. Labeling yourself a Christian, your opinion of the Apostles' Creed or whether your a true believer...none of this really matters until its right for you.