I've been thinking about a friend of mine all day. We have always been true to our Christian faith, and she has consistently been a vocal opponent to prohibited lifestyles. I am as well, and thought we saw eye to eye.  We have always been in agreement about the homosexual lifestyle, and have even attended prolife rallies together in the past. 

Well two years ago she went through a divorce. She then started living in sin with her new boyfriend. Premarital sex is a sin in my book! Now they're engaged and she wants me to be a bridesmaid. I don't know how to face her. I believe all sins are equal under the eyes of God. She disagrees and thinks this is not an equal sin to God! She has even misquoted Holy Scripture to our pastor to defend her actions. She thinks that if the church performs the ceremony she has not even sinned! I truly believe as Christians we should never knowingly sin. How could I possibly stand up with her as a bridesmaid with this on my conscience? What do I tell her?

I'm posting this anonymously because I'm afraid she'll see it, as they are even discussing ttc.