There's too much scripture talking about why it's not alright for these things to happen, let alone to support them. I know you feel you're being kind, and are helping them, and are supporting them.
But, it's not THEM you're supporting. It's the spiritual wickedness that is living in and amongst them that you're supporting. So no, you cannot support both the Father, and gay marriage. Someone who is homosexual, isn't born that way. People sympathize with the spiritual oppression of homosexuality today based on the idea that people are born that way, and that they're victims to circumstance, which isn't so. This is something that people claim is backed by science, but so far, this has yet to be proven. Being born gay, was was an idea that those involved in the gay community started back in the 80's to make it so any words against homosexuality would be on the same level as talking against blacks - people quite literally born that way. It is something we need to support to an extent, but only in the sense that it's the person, and not the sin. We need to pray for them, so that יהוה (God) gives them eyes to see and ears to hear, so they can repent for their sins, as well as the sins of their fathers. It is something that they're born into, but because of spiritual wickedness. Supporting that spiritual wickedness, will not help them, nor you. But, praying for them, showing them the loving mercy of יהוה will help them realize what's happening, and fend it off with the love of Elohim. (Father, Son, and Spirit).
Romans 1:21-32
21Because that, when they knew God, they glorified
him not as God, neither were thankful; but became vain in their imaginations, and their foolish heart was darkened.
22Professing themselves to be wise, they became fools,
23And changed the glory of the uncorruptible God into an image made like to corruptible man, and to birds, and fourfooted beasts, and creeping things.
24Wherefore God also gave them up to uncleanness through the lusts of their own hearts, to dishonour their own bodies between themselves: 25Who changed the truth of God into a lie, and worshipped and served the creature more than the Creator, who is blessed for ever. Amen.
26For this cause God gave them up unto vile affections: for even their women did change the natural use into that which is against nature: 27And likewise also the men, leaving the natural use of the woman, burned in their lust one toward another; men with men working that which is unseemly, and receiving in themselves that recompence of their error which was meet.
28And even as they did not like to retain God in their knowledge, God gave them over to a reprobate mind, to do those things which are not convenient; 29Being filled with all unrighteousness, fornication, wickedness, covetousness, maliciousness; full of envy, murder, debate, deceit, malignity; whisperers, 30Backbiters, haters of God, despiteful, proud, boasters, inventors of evil things, disobedient to parents, 31Without understanding, covenantbreakers, without natural affection, implacable, unmerciful: 32Who knowing the judgment of God, that they which commit such things are worthy of death, not only do the same, but have pleasure in them that do them.
It's not something you should support, but you should love the person. Be their light, and lead them from the rocks, to the golden shore that is the salvation of Elohim.