Discrimination based on gender, race and sexual orientation. Victimising people on the basis of things about them that they cannot change.
Maybe you would like to have a go at responding to the points I raised earlier:
1. Promoting prejudice and discrimination is contrary to the spirit of Christ's teachings, as conveyed in sayings like these:
"Do unto others as you would have them do to you", "Don't judge or you will be judged", "Love your neighbours as yourself", and so on.
2. Christ himself didn't say anything about homosexuality:
http://www.huffingtonpost.com/2013/12/22/what-jesus-says-about-homosexuality-_n_4489452.html
3. The10 commandments don't mention homosexuality. If homosexuality was such a big deal if would have been included.
4. The Bible condemns all sorts of things, including shellfish, but people are very selective according to their own prejudices.
5. Not all Christians have a problem with gay people, so it seems like a choice rather than a requirement of the religion.