I know what the Bible says is true. And I do my best to follow what it says every single day. However why would one belive that they should follow the Bible's standards if they don't even believe that it is true? Or that they don't even believe that there is a God? Also I do know that the Bible does talk about same-sex relationships a few times such as Leviticus 20: 13: "If a man also lie with mankind, as he lieth with a woman, both of them have committed an abomination: they shall surely be put to death; their blood shall be upon them." But the verse is a part of the holiness code in the Old Testament, which lists prohibited sexual relationships. While often interpreted as a condemnation of all homosexual acts, some scholars argue the Hebrew context specifically addresses acts related to idolatry and exploitation. But again someone who did not believe in the Bible would just see it as any other "story" book so you can't expect them to follow anything it says. And may I also add that there is no mention of same-sex relationships in the ten commandments!
"I am the LORD your God; you shall not have strange gods before me
You shall not take the name of the LORD your God in vain
Remember to keep holy the LORD's Day
Honor your father and mother
You shall not kill
You shall not commit adultery
You shall not steal
You shall not bear false witness against your neighbor
You shall not covet your neighbor's wife
You shall not covet your neighbor's goods."
Which means even if being in a same-sex relationship was a "sin" *which I'm pretty sure it's not.* lying, stealing, lust, and jealously are WAY worse and yet you do probably lie and or get jealous daily. So maybe spend less time being homophobic and spend more time "loving thy naghbor".
Website you may want to spend some time looking in to:
https://www.hrc.org/resources/what-does-the-bible-say-about-homosexuality
