This is one of those very difficult situations. I had a friend who did just what you are proposing. He and his family have spent the last 20 years drifting from one non-denominational church after another. They lost their Catholic Faith and after a relatively short time in a particular church, they feel that their needs are not being met or they disagree with the pastors teaching and move on. They still profess a strong belief in Jesus Christ and the Bible as they interpret it. They are like rudderless boats in the shifting winds of a storm. Your wife asks for your support and I think it is more appropriate that you ask for hers by her attending your Church with the children instead of the other way around. She is the one who has pulled the support she owes and promised to you as her Catholic Spouse when she married you. She does not deserve, nor do you owe her the kind of support she is asking for. All you can do is allow her the freedom to go where she wants, and stick to your Faith for the children and yourself. There is a danger that becoming a Bible fundamentalist she will decide as it says in St. Paul that you are unevenly yoked and will leave you probablyu taking the children along. It is a difficult and painful decision and I thank God I am not in your position. You will be in my prayers.