Christians are in a pickle.
They want the kingdom to come - for all goodness comes with it.
Yet seeing as Gods laws being broken is an integral part of a person being convinced they are lawbreakers (which is instrumental in their salvation) all that upholds Gods law (such a no gay marriage) seems to work counter-salvation.
You could understand that we can be two-minded about such things. Not wanting people to be allowed freefall into sin. Yet realising that the depravity of sin is their only hope. Parents experience it: you have to let go but you don't want to let go.