How can you call yourself a christian and be pro "gay marriage" or pro-choice?

"Christian" is a human designation, which, today, is comparable to male or female! There are no requirements for being one of those, and all can easily be changed. Saved is more precise, and cannot be honestly used without a heart-change. Christians are not perfect, by any means! As an example, I call myself a Born-again Christian, because that's what I am! It is not our place to judge others.