I hope you are able to discern the generic “you” from the specific “you”; you personally may never interact with them.
“You” are obligated to recognize their union as a marriage, and if you own a company “you” are required to extend them financial benefits, and if you are in the government “you” are forced to treat them as a cople for tax purposes.
That is how “you” are forced to do things when two women get “married”. And your religious beliefs may be against gays. (say,.. like Muslims)
Marriage was (for thousands of years) a RELIGIOUS institution. Now it is a government defined institution.
You make an interesting argument. Gay marriage, as you say, does not affect me as an individual. That being the case, I have no dog in the fight and approach the matter for the perspective of ‘you are free to do anything that causes another no harm.’ I am neither bound by nor a party to the marriage contract of others, gay or straight.
As for marriage and religion, the alternative is civil unions to set the legal aspects of the ‘partnership.’
As an individual, I really don’t see what all the fuss is about. Let people live by their own lights wherever possible.