A "Christian's" choice of association, whom they will sell to or serve a meal to, ends with the application for a business license.
A "Christian's" right to judge others ends at the front door of their church and/or home.
Churches forfeit the right to discriminate against anyone as soon as  they apply for a non-profit status.
Christians are instructed to "come out from amongst them" ... to live a personal life according to the Life-Force of God, as exampled by Jesus. They have not been instructed to coerce the rest of the world into following their beliefs.
The real Christian church has few members, which are scattered far, with few in between. The mainstream church became apostate, over 1800 years ago.
Your arguments are with the apostate and worldly church, which the real god has nothing to do with. His path is narrow, and few travel on it.
Whenever you meet a real Christian, you will be able to tell, as they will not judge your life choices, and they will quietly live a godly life.