All religions and anti-religions are equal in modern America.
Islam, Mormonism, the church of the gay goat lovers, the church of atheism, Catholic, Episcopalian, any and all the same in equality yet with different ideas of what marriage is.
This modern dogma is irrational and untenable. Ethics necessarily are the result of religiously held postulates. For example the Christian has a reason to legislate against murder as moral crime that has a civic remedy, but if one declares all views equally valid, one of those views might be that murder is not morally odious, but preferred in many cases, like abortion, euthanasia for the infirmed or the infidel. Religious commitments underpin moral judgements and moral judgements inform civic law. It is not possible to have a neutral society; neutrality of necessity is anarchy and anarchy leads to tyranny and when the population is bound by the fetters of the tyrants the only rule of law is violence.
Marriage is a 6000+ year old institution that in all cultures and all peoples up to the present time has always either meant a union between one man and one woman, or between one man and several women in order to produce and raise children.
If some idiot comes up with a new religion that declares the value of pi to be 934.33, then they are simply wrong, even though they claim that they are religious.
Enough with the Catholic bashing.