You are voicing it here and asking for support. Good!
The problem is that you
are both evil. This is just the obvious state that we all exist in, full stop. I want to address what you've said, briefly
You are fully under spiritual attack. But, you should not fear. To the devil it is temptation, but to God it is the test of your faith. What happens if we persevere in following Christ? Matt 24:13 says "But he who endures to the end shall be saved." Apply this to your marriage and seek God's hand in saving what evil is trying to tear apart. Remember, satan knows the world system will divorce itself without his help. This allows him to focus all his efforts on hurting you both.
She won't pray with you? Is she a believer? Don't give her an opportunity to say no, but approach God with her asking for his hand to change YOU. Follow Jesus and lay down for your bride that she may be saved. And, she is still your bride, though you may have stopped thinking of her as such. But dear friend you both must pray and pray in every occasion. But, confess your sins TOGETHER! This is how you call on God as common sinners to help you defeat the attack mentioned above. See James 5:16 "Confess
your trespasses to one another, and pray for one another, that you may be healed. The effective, fervent prayer of a righteous man avails much."
Mistakes means existing damage. Think of a beat up
car driving down the road with a lot of body damage. By looking at it you can assume it has been in a few accidents, but they remain. The owner obviously doesn't have insurance, or won't pay the deductible. Some are old dents and some are even older...but they've never been repaired. Is this what has happened to your marriage? Mind you, you're still driving the car, so whatever it was, you weren't knocked off the road. Again, confession is important, but biblical counseling is even better.
You need to change your approach to surrender your marriage to God. This starts with both of you confessing your sins to each other in front of God, fearfully.
Let me close. My first few years of marriage got bumpy. BuMpY. We just celebrated 11 years and we are more in love now than ever. We are both seeking God with all our hearts, and praying together in all things. If we start to argue, I grab her hand and pray. If she screws her face up at me, I grab her hand and pray. If you do not, you give the devil a foothold.
Years ago when I was single, I listened to a great message from John MacArthur found
here and if you have an hour, it is worth the listen. The message is from 1975, titled: "To Marry or Not to Marry" and it really does bring it all back to your understanding of your commitment, your God, and your relationship's future.
The moment you don't want to fight anymore is the moment you need to most. I will lift you up in prayer.