Okay, here is the problem with his premise- he's assuming churches will be forced to marry same-sex couples. This isn't what the fight is about. Even if this is a step in that direction, they aren't dependent on each other, so go ahead and let them marry, then make your stand when they want "freedom" to be married in any church.
Another issue I have is that he is saying that allowing gay people to marry is infringing on the rights of religion. Again, this is a bit fuzzy. Religion is definitely infringing on the right for some to marry (happiness), but how does it affect the church if two people get married, especially in a civil ceremony? Again, they are making the leap that gay marriages will be forced into churches. Feel free to fight against that, but this straw man is not what homosexual couples are fighting for.
Far left vs far right- lots of semantics here, but the right wants to ban gay marriage. The opposite of this extreme would be to ban straight marriage/only allow gay marriage. The middle ground is to allow both.
On guns, he didn't seem focused on any one point (that I could tell). It's a crime no matter if the right or the left shoots someone. I feel like I don't have the entire conversation. Was there someone arguing against this that he was responding to?