It's part of the roots of Buddhism; Eastern religions got a lot of cross-breeding or borrowing.  Hell, not that Western religions didn't!!  The Old Testament and the Qura'an both borrowed heavily from Torah.

Some Eastern countries, however, such as India, have become homophobic due to European - specially British - colonialism.

Exactly!! I was raised in a Hindu household in Southern India, and have read numerous religious books and stuff, but there isn't a single word against homosexuality. Even sex as a whole, wasn't seen as taboo or anything like that. We literally had temples built with inscriptions and sculptures of sex.

Even the current law which literally makes gay sex illegal (They made "carnal sex" illegal on the ground that it wasn't "ethical") was taken from a British regime which had the same law.

Even the transgender community in India, called Hijras, were greatly respected in the past. They held very significant posts in the Mughal Courts in the 16th and 17th century. But now, they are shunned and discriminated against. They are not given jobs anywhere and are thus forced to resort to begging and prostitution.

But to convert to Hindu Dharma, one has to connect with a Hindu family through marriage/adoption.

Evidently Apollo and Zeus were both bi

Originally, the proposal was to only allow civil gay marriage.  Now churches (not individual congregations) can OPT IN to doing gay marriage.

Buddhism, Wicca and others are pro - gay

There is a difference between religion and how people practice their religion. Is there any "old world" religion that when it was written proclaimed been gay was okay, I highly doubt it. But then you could always start your own book.