Also, isn't interesting the argument Kirk gave to basically try and give himself a license to sin...yes, the earth is the Lords, but not everything currently in it is of the Lord, because this world is corrupted by sin...actually, now that I think about it, if Kirk says everything in the world is of God therefore it's all good...sin is in the world...is he saying sin is of God? 
That's not really the issue because he didn't argue that. The way to handle him is to ask him the following questions:
Is everything God makes good? - He would say "yes," and I would agree. Even hell is good for its intended purpose.
Can men do things with God's creation that is evil? - He would have to say "yes" or look like a moron because all I have to do is bring up a church-ianity hot topic, like abortion, and he would look like an idiot.
So once he's answered those questions, he's trapped. At that point, just use abortion.
-Did God create babies?
-Does mankind do things with babies that is evil? After all, pagans do things with babies that we wouldn't even want to know about, so does that mean we should ignore it, as Kirk suggested in his speech?
I'll tell you exactly where the conversation would go from that point: He would argue that pagans "corrupted" Christmas as he stated in his speech, and at that point, he's dug himself a hole very deep because all I have to do is ask him for evidence that Christmas was a celebration that the early Christians recognized, and pagans came along later and ruined it.
That evidence doesn't exist. Game. Set. Match. Thanks for playin' Kirk.
