One of the main reasons so many reject the Christian religion today is that it has become, well, too much religion.
“If religion is characterised by the recruitment of God to serve our agendas, and faith is about putting our agendas at the service of God, then clearly there is too much religion in the world, and not enough faith.” – Bishop John Saxbee.
Basically this is describing how many "christians" today look at religion with the question, "what can I get out of this for myself?" A lot of people also ask, "What belief system am I most comfortable with?" instead of "Which belief system do I really believe is true?" The result is that many people grow up in Christian homes and just claim Christianity as their religion because it's comfortable. Christ was all about loving and giving one's self to others, but many are more concerned about fitting in. The result is your all too common stereotypical hypocritical Christian. They claim the name of Christ but do little to show it.
Christ's original followers did not call themselves Christians. Other people noticed their actions and labelled them for what they did, which was acting selflessly as Christ had done.
As far as fitting in, the same thing often goes for many who blindly follow the complete intellectual road. People can be afraid to ask the big questions which may appear to have supernatural answers, but they are afraid to voice their opinions and thoughts. They're afraid of appearing stupid to friends who strongly believe any belief in God is unintelligent. Not to say many don't come to this conclusion themselves, just a side note there...
Anyways, this hanging onto Christian beliefs for a sense of righteousness, a sense of belonging, or just a ticket to heaven has left much of the American Christian Church divided and ineffective in helping others. People argue over small interpretations leaving the church divided by customs. This in general can give a very bad appearance to anyone curious about Christianity. I'd encourage anyone curious about what Christianity is about to study Christ. Don't study the people who may just be claiming Christianity to fit in or feel good about themselves, study the source.
That being said, there are a lot of great Christians out there. I've seen Christians help other people completely turn their lives around from drugs, alcohol, and unhealthy relationships through Christian communities and support, so I know there is a lot of truth to what Jesus said and that not all who claim Christ are jerks. There are a lot of mini-debates that popped up as far as the Psychology of Jesus that would be pretty interesting to discuss. Psychologists have studied Christ by the way, looking into personality types and the improbability of someone being insane (claiming to be God) and still speaking so many truths. Another side note, we often think of Christ as extremely conservative in our culture, but in his day and age he was very liberal. He threw aside social class and gender role norms of their culture to give a strong message of equality.
Have a great Saint Patty's Day everyone!