Lewis and Marriage, Outside Reading 3

In Mere Christianity, CS Lewis tells his view of Christian marriage, and ultimately concludes that there are two conceptions of marriage-- the Christian and a state governed marriage. He says that there is a debate among Christians as to how much a Christian should press upon their view of marriage to the state. Lewis says that one should not impress it whatsoever. There should be two distinct kinds of marriages. One of these the state should rule over one, while the church ruling over her members in the other kind of marriage. However, he says that the distinction between the two should be easily seen among man. Tolkien is absolutely annoyed with Lewis' view. He says that there is no Christian morals that are valid for Christians only. He uses Lewis' "human machine" and says that Christian marriage is the correct way for the machine to run, so how could there be two distinct marriages and yet have the machine run properly? Which of these views do you most align with and why? Should the church be involved in the state when it comes to marriage?