The argument of whether homosexuality is genetically driven or is a personal choice is completely irrelevant. Since there is no legitimate reason people can’t be gay, it is therefore OK to be gay.
Almost all objections to homosexuality are religiously motivated. But religions lack any moral authority because they are all based on false (man made) gods. Most “believers” realize this – that the only reason they believe is because they were born into their religion. That religion is a part of their inherited culture.
But not so for the religious radicals who have been so thoroughly indoctrinated and have lived for so long in their echo chamber that they have lost their ability to reason and believe their sacred text without question. Whether it be the Bible, Torah, or Koran.
All religions are based on false gods therefore any judgments they make about homosexuality or morality in general are only relevant to their believers. That homosexuality is a sin against the Bible is a circular argument irrelevant to outsiders.