My Two Cents
Sam, for what it's worth, here is my two cents.
First, being gay is not a "lifestyle". One may live an extravagant lifestyle or maybe even a self-destructive lifestyle. But there is no such thing as a "Gay Lifestyle". That is just a term made up by right wingers to dehumanize us. They use the word "lifestyle" to imply that we do not live "lives".
Secondly, you are a grown man I presume. I don't see where it is any church's business (Or your father's business for that matter, assuming you are a grown man,right?) how you live your life. Do you really need to belong to a church that condemns you for your identity? I can't speak for you, but I can honestly say it would not be good for my mental health to be influenced by these type of people. Life is to short. I would just have to put them out of my life and move on to more positive things.
I don't know if my thoughts are helpful. Good luck with whatever you decide to do!