[Wyrd bið ful aræd]

"Many of them know full well that the marriage itself is not valid at the time of the ceremony or soon there after."

And don't they feel silly -- but it doesn't matter. However stupidly you enter a contract, if you sign your name on the dotted line, its binding.

Doubly so for a contract sealed before God Himself.

[Kansas58]

You have shown your ignorance now.
A VALID marriage requires sincere, conscientious, and informed consent to the duties of married life, in an atmosphere free of coercive forces or ulterior motives. A valid “contract” under Church and Civil law also requires mental competence of the parties involved.
If this is not the case, GOD DID NOT BLESS THE UNION!