It's not uncommon for people to dislike Christianity because of the way they've seen alleged Christians behave. While this is understandable, it's also foolish and misguided.

If you want to know what Christianity is you should read the four gospels and get to what Christ was like. Then you'll have a legitimate appreciation or dislike of Christianity.

If you base your view of Christianity on people who call themselves Christians but act like wretched people, that's as silly as saying you hate Christianity because of the way Muslims or Buddhists act. Because if people don't look like, act like, represent, or even want to be like Christ, then how are those people Christians? They can call themselves that all they want but if you don't see Christlike behavior in their lives then you are wrong in forming an opinion of Christianity based off of those people.

Look at Christ instead.