No one has said a gay cannot enter a church. I know many re-married Catholics who attend mass regularly, receive the sacraments and raise their children in the church. They are technically excommunicated. The difference is they don't teach divorce as their way of life. They teach marriage and the duties of the parents to their children to society.
This gay thing is TEACHING homosexuality as proper behavior. It is not. There are no real goals. It is a life of "pretend".