Why should I be offended gnu? If you mean GO GAYS! as in good for you gays! great gays! wish you well and all... then I see no offence to be made. If humour works for support then use it.
And tbh, for every one church goer I know who would reel at the thought of gay people in church, I know two others who hold the opposite view. Not every religious person has a down on gay people having the life they want. Live and let live eh? amen.
The only thing that would offend me is when people tell gays to GO!
I do not think you meant it the latter way somehow