There are many reasons why I hate Christianity--and yes, I do literally hate Christianity. Why?--because of the negative doctrines it promotes, and the resulting "moral laxity"--which the Christian philosopher Pelagius pointed out long ago. Let me explain by offering the following analogy.
The following would be a "life situation" for many, and is analyzed from a Christian perspective:
Christians believe they are born bad, and cannot help but to do bad things because they are "born sinners." (Original sin) Now, a Christian man who says he loves his wife still beats her because she doesn't do as she is told. She forgives him for hurting her every time, because that is what her religion tells her to do. The man beats her because the same religion tells him he has authority over her, and he cannot help but to do bad things, so he does them thinking he can't help himself--but it's ok, because his god will forgive him. Until one fateful day when a beating ends in death, and he kills his wife with his bare hands.
THIS IS WHY I HATE CHRISTIANITY. I hate the fact that this religion tells people they are EXPECTED to behave badly. I hate the fact that there are NO CONSEQUENCES for their bad behavior in this life or the next for believers as long as they sincerely say "sorry" to Jesus. What about the victims?? What compensation do they get under the Christian system? None. There is no justice for victims of Christian crime--unless it is through secular laws. Therefore, Christianity in and of itself is IMMORAL and UNJUST. This is the biggest reason why I HATE Christianity.
If people believed they could do the right thing the first time, and took responsibility for their own actions instead of having "Jesus" do that for them, the world would be a much better place to live in.