It's treading old grounds, but unless you 180'd at some point, you do hold to the belief that homosexual acts are sinful, yes? More or less explicitly and only because of biblical passages related to the subject. You've noted as much a couple of times, if my memory's not failing. Try not to let that belief influence your
actions towards those inclined such way, iirc, but... the condemnation is still there. The act is still a sin, even if the only reason you've offered is a holy text. It's one of the arguably lesser examples -- general stateside christian reaction to Islam would be a greater one -- but it's an example of how religious beliefs* lead people to separate themselves from others on an ideological level. Even -- often, especially -- when there is little functional reason to do so.
And... even when it's not intentional, or sought to be actively avoided, that sort of separation has an entirely too strong track record of influencing
action. Almost always negatively, even if only in small ways. Many individuals do manage to avoid such separation, but... many also don't. Many, indeed, do not.
It's not the whole picture, of course -- things like in-group/out-group differentiation is a
tremendously multivariant subject, of which religious beliefs are only a particular subset of influences -- but... contributing cause, y'know?
What I've seen church and religious organization do to people, communities, countries, both in my life and in history... is one of the major reasons that while I'm quite accepting of spirituality, I have a fairly virulent dislike of organized religion. To me, it has strongly contributed to causing tremendous damage to my species. As sins go, there are few greater ones in my eyes.
Spirituality's pretty fun, theological discussions are great, but gods save me from the church.
*Though, again, religious beliefs are
far from the only cause of such, just to make that excessively clear.