Just because many Christians aren't accepting like they should be doesn't mean Christianity as a whole is bad and should be written off as fake. If you look at the Apostles and the other early followers in the bible, you'll find very few 'upstanding' members of society. Most of them were tax collectors (seen as traitors for working for Rome and mostly dishonest), harlots, and other 'not nice' people. Jesus didn't reject them based on what they had done in their past or "the kind of person" they were, and neither should we today. As for the not understanding everything, that is where faith comes in. We can't understand everything everywere. This may be a silly example, but its what I can think of off the top of my head, but I don't have first-hand experience with getting run over by a truck, but I'm not going to walk out in the middle of the street to find out if I will actually get hurt if I get run over. I believe that my mom knew what she was talking about when she told me not to walk in the middle of the road when I was a kid. Some things we kind of have to accept in the end. We can come up with reasons, but no one can 'prove' some things. At least that is what I think, your beliefs may vary...
EDIT: Cleaned up a bit to make better sense...