Doing so provides an active testimony that "says" the state is the Lord of your marriage.

By definition (check out any decent law dictionary) a license is "permission granted from a sovereign to do that which would otherwise be unlawful."

A marriage license creates the legal nexus for Child Protective Services and the entire body of "Family Law."

God does not give authority to the civil magistrate to rule over or regulate any aspect of marriage.  Where authority is not granted, none exists.

The system of civil law and established public policy that we now have is officially set against the godly family, therefore it is even more egregious for followers of Jesus Christ to officially designate them as the "over-seer" and authorizer of your marriage, or marriage in general.

Marriage establishes the family.  When we apply for a marriage license we testify falsely that the state establishes the family.  As followers of Jesus Christ we are not to bear false witness.

Yahweh is the Lord of marriage, the family and everything else.  We are to look to him for every need in these matters.  To do otherwise is to bear false witness to His character and authority.

The church is the "pillar and ground of truth."  When we as individuals and especially as leaders in the church go along with these anti-Christ schemes we are with our actions lifting the state to a position that belongs only to our professed Lord and King.  REMEMBER WHAT YOUR MOTHER TAUGHT YOU: ACTIONS SPEAK LOUDER THAN WORDS. The Bible puts it more like this... "they honor me with their lips but their hearts are far from me."