1. Compulsory love of a being that I must also fear at every turn. I don't know what thats like, and I don't ever want to know what thats like.
2. Morality, ethics and good all came to me without the teachings of Christ. I don't do good because I think I may be rewarded by god, nor do I restrain from bad because I fear punishment from him. I do both because I'm a human being with a mind that has endless potential for understanding of good and evil without being scared into it. Are the religious moral when they say they do things mainly for punishment/reward at their death?
3. Even in the elementary, incredibly feeble understanding I have of our earth, our universe, our species, I still find them much more awe inspiring, fascinating and humbling than any story about an invisible man or burning bushes. Christianity is simply not needed for me to understand anything about myself or the world around us. And I submit, it's not needed for anyone.
Theres a ton of other reasons.