gay marriage

I received an invitation in the mail to attend my gay cousin’s wedding. I am conflicted about going. I love him, and his partner is a very nice guy. They both grew up as Christians. On the other hand, the Bible teaches against this, and I think I would feel uncomfortable at the wedding because of this. What should I do? Should I say anything? How do I maintain a relationship with them even after the wedding?

Mark – Atlanta, Georgia