It’s not about religion. It’s about having the same rights that are afforded to others. Most people just take those things for granted, but gay couples have several disadvantages that straight couples don’t have to worry about.
We aren’t covered under each other’s health insurances, we have no legal standing over each other’s property in the event of a death, we can be kept out of hospital rooms and funeral plans because we aren’t related by blood or marriage… the list goes on and on.
It’s more about love and PROTECTING your partner, than about an endorsement by religion or society.