Why do many Christians dislike and fight against LGBT people?

The same reason people dislike and fight against anyone. Fear is at the root of all bigotries. We have to overcome our fear of differences and if we're Christians recognize Christ's command to Love our neighbors and do unto others what we want done unto them trumps everything.

It makes a group of people bond together when they have a common enemy. Sharing ideas with a group of people even if they are not popular is part of the human condition. In pack mentality, facts and the truth don't play a role.

They have no self esteem or feelings of self worth. Thus, In their minds, demonizing people or groups subordinates those people or groups to them and gives them a shot of self esteem and self worth, albeit an extremely small shot which dissipates in a very short period of time.

I love them

''Surely if there God were all powerful and on their side then they could just sit back and wait for him to smite us.''

judgment comes after death

Some of them are atrocious selfish promiscuous pigs. If you know them YOU KNOW.

because LGBT people? being immoral.