"Marriage" is the term under which those rights are defined. Marriage is not a religious construct. Rather, religion and culture are deeply intertwined, but you seem to be accepting the Christian Right's assertion that it alone can define marriage. But I reject that claim. They are free to place their own restrictions on marriages their churches will endorse, but they are not free to define my marriage. Turning the word "marriage" over to "religion" (and ignoring the millions of religious people who fully support same-sex marriage) does more harm than good to reaching our goal of equality.