If you are employed in a federal institution that provides services and documents the public, then you most certainly do NOT get to make deny the public services and documents because of your religion.
This is non-negotiable.
The constitution of the United States guarantees freedom of AND from religion as well as separation of church and state. This means you're free to practice your religion BUT at the same time, you can not use the government to enforce your religion on the public.
And for the record?
Christianity and all other related religions do NOT have a monopoly on marriage. Older civillations and belief systems had marriages. Of those, many did not strictly say man and woman. Some of them recognized other genders.
Again, fuck your religion and fuck you for trying to use gofundme for your bullshit.