I've come across news articles (https://medium.com/@adamnicholasphillips/the-bible-does-not-condemn-homosexuality-seriously-it-doesn-t-13ae949d6619 and https://www.huffingtonpost.com/adam-nicholas-phillips/the-bible-does-not-condemn-homosexuality_b_7807342.html) that have done in-depth research on what the translations actually mean.
I also did my research and found out that...
...these articles were right.
Today's definition of homosexuality wasn't in the Bible. "Homosexuality" then wasn't today's equivalent. Today's homosexuality is mostly about rights and equal treatment.
But back in Bible times, sex with the same gender was more a show of power and ruthlessness.
Sodom & Gomorrah's sin - though it looks it from first glance - wasn't homosexuality. It was inhospitality. And they showed the inhospitality by treating their neighbors horribly through sex. That's what they wanted to do to the angels (aliens) who had bunked at Lot's house. If that was in the early 1900s, it was as if whites wanted to grab African-Americans from a malt shop and beat them up just because of the color of their skin. Since hospitality was a big thing in Middle Eastern culture, they were punished for that through the fire and brimstone.
Now in Roman culture, same-sex relationships were socially again a show of dominance and power. An older male would usually have younger men around him to show his status. Militarily-speaking, male Roman soldiers were encouraged to have sex in order to deepen their bond and function better as a team.
So in relation to today's homosexuality vs. Biblical "homosexuality" (which is actually just toxic male dominance through sexuality), that's probably why some Christians believe it is moral to be a homosexual by modern standards. They're not hurting anyone or asserting their identity by sexual dominance.