if you have a girlfriend/boyfriend with different religion, and your family doen't want him/her to be a part of your family unless he/she will convert his/her religion, what will you do?
I think if you are serious about your faith, you will not date or marry outside your faith. And if you are not serious about it, then you don't care, and what your parents say does not matter.
Honestly, I believe religion has always just served to create barriers and distance among people. I believe in God and I have faith. If religion is the only reason my parents turn my choice down for, I'd go ahead with my love any ways.