There is a big difference between something like religion, and race. Religion, there is the possibility to have proper discussions about the subject. There is then the possibility that some people will get offended by perfectly reasonable discussion.
Whereas with race, there's not really much to discuss in the first place, so it doesn't come up as much. As many other people have stated, Christians form the majority of the English speaking world so I find it hard to believe you are all being picked on by a minority. There are many forms of discrimination that are much more serious.
Furthermore, the majority of 'discrimination' against Christians is not actual discrimination. If you believe that God caused the Big Bang, which set up the formation of the planets, which led to evolution and thus to the present day, there are very few people who would care enough to discriminate against you.
Regardless of wether you are religious or not, if you believe the Earth is 6000 years old, or that the origin of life on Earth is anything other than evolution, you will be ridiculed. If I, an agnostic, were to believe these things, but attribute it to something other than the divine, I would still be ridiculed - hence it is not discrimination based on religion, it is discrimination based on believeing something that is not true.
