I'm not going to say that the Bible condones homosexual activity. Because it doesn't. Scripture says what it says, and if I'm dissonance in the Echo Chamber, so be it.
In 20-30 years, when your denomination sanctions gay marriage and even your particular church building performs them, you'll find some contrivance for how you were never actually wrong and the church isn't now either. Maybe a long string of paragraphs about how Muslims were always worse to the gays or something.
I know very little about Pentecostals, so I have no idea if there is a powerful pro-LGBT movement within that denomination. However, I have little doubt that in 20-30 years Bible believing Christians will be very unpopular. Anyone who still identifies as such won't care about social pressure at that point I think.
What is it with homophobes and thinking that the only reason we want them to change is "social pressure"? It's because accepting LGBT people is the morally right thing to do, not because it's hip or trendy.
Being opposed to same-sex marriage and relationships does not make people homophobes. A lot of this LGBT movement has to do with social pressure. It's not even known how many people ACTUALLY support same-sex marriage. Many of the polls from various research centers show same-sex marriage support around 68%. I do not believe that support is that high. I think many of those opposed to same-sex marriage are afraid to share their beliefs due to the hostile political environment we live in today. There is lots of hostility towards those who oppose same-sex marriage. I have even received death threats. You all think that I am the intolerant one. Why do you care if somebody opposes same-sex marriage? It's not your business! How does it effect you in anyway?
Now that us gay people can get married, it affects us much less. People should not be hurling death threats at you for any reason, let alone opposition to gay marriage... but your opposition is not harmless. You are basically just writing off a whole segment of society based on whatever reasons you have for opposing same-sex marriage.
If you do not want to allow committed long term same sex couples to marry, they are then denied certain rights and privileges under the law. That does harm. A major issue was gay partners not being able to visit their dying partners in the hospital because of rules about family ties.
Imagine if you were denied seeing your dying parent in the hospital because, say, you were adopted? Or it was your step-father who raised you?
I would say that goes beyond simple harm. It would be traumatizing. If your political belief or religious belief is forced on others to the point that they experience trauma... then you are, at the very least, intolerant... and homophobic. You are so afraid of going against your belief that you would traumatize someone else permanently for a little arbitrary peace of mind.