This is Matthew Vines. He has a sermon you need to watch. It's long. And 250,000 other people have already watched it (that's how good it is.) But I can't begin to tell you how important his ideas are.
At 9:05, he pulls at the heartstrings of anyone who has them. At 24:12, he demolishes all arguments based on Leviticus, and he explains something you'll never forget about Old Testament "abominations" at 29:12. At 35:37, he unpacks the thorniest New Testament passage, burying the "unnatural" argument once and for all at 47:06.
At 58:48, he makes one of the most effective Bible-based arguments for gay marriage you'll ever hear. And at 1:03:32, he closes with a plea for acceptance that's been melting the hearts even of dyed-in-the-wool Southern Baptists.