The fear is that the demands for "gay marriage" and government endorsement of the practice is turning into a crusade against religious groups and private individuals who do not approve of the practice. And that fear is becoming a reality, as extremist homosexuals sue everyone who does not sing their praises.
Look at the UK, where churches are now penalized if they refuse to perform gay marriages because of their religious beliefs. A service provider should have the right to refuse to serve a customer, and a religious group certainly should be able to say we won't serve those not within the faith or adhering to its principals. Yet churches are being fined for not performing religious marriage ceremonies against the beliefs of the marriage.
We are also seeing Christian foster parents removed from consideration, because of their adherence to a belief system shared by all major religions in the world and the vast majority of human history and civilization. Religious schools are penalized, with lawsuits or removal of government funding, because they teach a theology thousands of years old in contrast to a political expansion (gay marriage) of the past 40 years, Ancient Greek exempted.
A caterer in Arizona was fined thousands of dollars for refusing to make a wedding cake for a gay marriage. Not wanting to make a cake for a gang initiation? No fine. Not wanting to make a cake for someone whose marriage she did not support because they're a jerks or on a fifth marriage? Probably no fine. Refuse to make a cake for two homosexuals, now she faces civil penalties at the hands of the government.
Tolerating homosexuality is part of our culture for 40 years. The problem is the increasing demands to not only accept it (which is bigger than mere tolerance) and punishment of those who disapprove or even fail to sing the praises of a recent cultural phenomena at odds with thousands of years of human civilization.
Before the gay mafia jumps in and calls me a horrible bigot for voicing these matters, I have two gay inlaws, including a brother in law, and am good friends with a homosexual man and his partner at our church.
Before screaming bigotry at Christians who stand with 2000 years of their traditions and 6000 years of Judaism, go read the Koran's explicit exhortations to kill all homosexuals - and the Muslim groups doing so even today, in between the honor killings of girls who want to marry who they want.