I totally agree that focusing on the financial side so that you are good to go in June is an excellent idea.
As for him moving out, you do have children so perhaps, just maybe, he will take that in to consideration. I would present it as they will feel more comfortable with familiar surroundings - and that is the truth.
It seems to me the longer you stay in this unrewarding situation the more it affects your self-esteem and confidence. If you don't make the break now I fear that perhaps you will wait more years.
I hate to see you so unhappy.
As for the church, what kind of church is this that would judge a person for leaving a situation that is making them so unhappy?
Honestly, if that is your church, if your fellow parishioners would judge you for this, then perhaps it's also time to find a new church with a fellowship that will show you acceptance, understanding and compassion.