Do not blame God for what has happened. You have to remember that the greatest gift that He gave us is freewill. Unfortunately that gift also give the enemy a foot in the door if we allow it. Your W has chosen a path that unfortunately is not the same as yours.
You are going to find that it really does not matter what you think, her mother thinks, or what anyone thinks in regards to your W. She is blazing her own trail right now and nothing is going to stop her.
You need to stop these desperate thoughts. I have been there. I know how they made me feel. Reading "Seven Habits of Highly Effective People" by Steven Covey changed my life because it shows a different way of thinking.
Right now it appears that you are still thinking reactively instead of proactively. You are still trying to control the way things are going. You need to stop. Letting go does not mean you have to stop loving your W or working towards an end that you wNt. It means letting go of the control that you do not have.
Acting like a whipped little puppy is not going to work. It is unattractive. If it unappealing to me I can only imagine what it looks like to her. Remember one of the big tenents of DB is... Be a man that only a fool would want to leave. You are not there.
No one has the secret answer except you. You are looking for a shortcut that does not exist. We can only help you if you help yourself.
“Things turn out best for the people who make the best out of the way things turn out” ― Art Linkletter