There is so much here, it's difficult to know where to start
"The wrong side of history, since God will be the judge of all mankind" - you mean like slavery and mixed race marriage?
"Obama blamed Jesus" - by appealing to the golden rule?
"It's the opposite to what Jesus Christ taught about gay marriage" - ummm, nothing?
"It's not a sin to be born as a black person or a woman" - what about: Original sin? According to your religion we are all born into sin.
"Would you be able to orient yourself to like men right now - if I made a compelling case? Sure, it's all about marketing" - Really? Not me. Unless it comes with a free toaster
"Homosexuality cannot be genetic" - genetic inheritance is not the only way you can be born a certain way. Epigenentics, mutations, etc
"Obama (by supporting gay marriage) is promoting sin to little children" The Bible also tells us that worshipping the wrong God is a mortal sin - is permitting Muslims, Jews, Hindus, Buddhists and atheists to marry also promoting sin? If not, why not?
"And God will say: 'the government deceived you'" - but God, you told us to obey our government because it is ordained by you, and rebelling against government is the same as rebelling against you!
"We don't want to hurt homosexuals" - that's God's job
"Deception is the way the devil persuades humans to choose sin" - no God does, "I the LORD hath put a lying spirit in the mouth of all these thy prophets"
"If two men are married, how does that affect your marriage to your wife? Well it probably doesn't hurt my marriage, my marriage is something my wife and I have to work on" - Bingo
"But it does hurt society by abusing children" - No, that's Catholic priests