How do I save my kids from Mormonism?

I'm BIC, RM, Temple Married who left the church a few months ago (haven't resigned yet). Wife is cafeteria Mormon who still wants to attend church with kids.

We reached compromise where kids stay home with me 50% of month and they go to church other 50%. I attend one non-testimony sacrament meeting.

I have 3 kids all under the age of 6. I'm mainly worried about two things at this point:

1. TSCC undermining me as a father by feeding them "your dad lost the spirit" bullshit.

2. TSCC brainwashing my kids into TBM "Follow the Prophet" robots.

So, I need advice/help on how to approach and raise my kids to effectively counter the above. When is the right time to bring up my disbelief and the details that caused my disbelief?

If I bring them up too early, will I have a situation where I'll just be a broken record when they're teens? "There goes dad again with his anti-Mormonism."

TL;DR I have a TBM wife who still takes kids to church. I want to know the most effective way to save them from Mormonism so they won't have to go through what I went through.