Could just keep to the basics of the golden rule?

Teach them that life is about continuous learning and growth. Let them decide on faith by allowing the discussion. Learn something new everyday. That we are fallible human beings.

So, you aren't 100% about everything, who is? Be gentle on yourself for that.

Teaching them to think on their own two feet is something to consider. That it's ok to agree to disagree provided it's conducted with respect.

I have one son that consistently questions the existence of God and whether Jesus was real, for example. However, I've explained to him that even if he chooses a different belief system that it's important to show manners(not that manners isn't a battle with him, but I keep trying) or there's no reason why we, myself and his brothers, need to share our rituals, such as Easter and Christmas.

Parenting is an imperfect experience to say the least. It's challenging, no doubt.

You don't need all the answers, just willingness to get through it.