Why do you think that we must DO something with them? Why do you assume that by stating facts about the Church's teaching on sins, that I must want to excommunicate everyone? They know what the Church teaches and where they do not, they need to be taught. It needs to be explained to them what and why these are taught. And that is where the Church has failed in the last 50 years. When you were in school, did the professor dialogue with you about scientific facts, or did they teach and explain them to you, and give you the information needed to have a well-rounded understanding? That is what the Church has to do. Explain what it teaches and why, for the good of souls. It can't force it's teaching on us, however it is within it's rights to refuse the Eucharist to those who refuse to listen and choose their will over God's.