You'll need to define many.
What you don't understand about Christianity is you generally need to be a sinner to be a good Christian, because you need forgiveness and if you don't do anything wrong what can you be forgiven for? FEW Christian churches would expel someone for being gay. Some would. Most would not, even if their doctrine opposes homosexuality.
That is the remarkable thing about Christianity compared to most religions. You don't have to act like a Christian to be one. Anything you do can instantaneously be forgiven like it never happened. Thus, the penalty for breaking the rules is all but non-existent. Just say "Dear God, I'm sorry. In Jesus name, amen" and you're pure as New York snow.
Numbers, i am sure there is research out there. But before you make a claim of "many" it really should be quantified as best as is reasonably possible.
Possible the Pew Institute may have some stats. I do not know.
As to anti gay- Yes a number of Christians do think it contravenes Biblical teachings.
That does not mean they hate them, some would, but that number is open for debate.
Same as those that think all Christians are anti gay - your phrase not mine. And they are all not of that position.
Your statement is wide ranging and far to encompassing of a substantial number who have no issues what so ever with homosexuality.
Killing one person is murder, killing 100,000 is foreign policy