Hmmm. Deep question. In a sense God makes me a Christian because He is the source of all truth, all grace and I come to know His infinite love for me through His Son.
But you may have meant: why have I (in light of free will) continued to be a Christian, especially when times have been tough? Well, if you're familiar with the writings of C. S. Lewis or Fulton J. Sheen I think they said it far better than I ever could. But if you're not, the best summary I can give is that Christianity is not (or should not be) a discipline or a philosophy...it is a transforming experience, a continuous metamorphosis that never ends, and must include every part of our lives and everyone we meet. Nobody is worthy to be a Christian, and nobody does it right. If you think you're the best Christian, then you are the worst, so if you think you're the worst, you're wrong.
It's not a cultural thing, it's not a historical thing, it's not a meditational thing. But Christianity is not anti-intellectual either. Christ told far too many parables to get his disciples to think, and got in far too much trouble for doing the right thing that happened to be outside of custom, for me to believe we are supposed to go through life with blinders on. The Christian view is vast enough to encompass all of time, all of this glorious universe, life, death, evil and love in a framework that is consistent and yet not trivial enough to be of mere human invention.
Of course, Christians and Christian churches have over time been responsible for evil events. However the same could be said about science, agriculture, family or tribal loyalty, education, national unity, politics, transportation, law enforcement, industrial economies, etc. I will not apologize for being a Christian, but I do apologize for many years of not being a better one.