If someone does not have an annulment from their marriage, they cannot remarry in the Catholic church, the church will not marry adulterers. I believe this is to be true, correct me if wrong.
As far as Protestants remarrying, it does say in Matthew that one can get a divorce if there is fornication between one of the two parties. Many people who love the Lord feel this means it’s okay to remarry since Matthew is the only place where Jesus says divorce and remarriage are okay under those circumstances. My only qualm is that there are two other places in the New Testament where Jesus says anyone who marries a divorced person commits adultery, so that is why I would rather not date a divorced man because I’m truly not sure if I would be committing adultery or not, and I certainly do not want to.
I guess my biggest problem with the whole thing is that they want to change the definition of marriage, and it would be obvious that they would be committing a sin if they did marry, since within marriage, there is a sexual or emotional union, most often sexual, and it would be wrong, not to mention, a perversion. Most people consummate their marriages. Also, if there is an emotional attachment and no sex, this is still a sin. I’ve learned through my own experience in the gay lifestyle that if one lusts after the same sex, whether physical OR emotional, it is sin, idolatry. This is the Truth as the Lord has revealed it to me.