I disagree. God is already out of most schools, and it isn’t working well at all. Each school needs its own fully-integrated approach based on the students at the school and what works for them.
We lie to children all the time to protect them. Reality isn't actually good to be exposed to when you are a child; it's much better to encounter it in a safer, nonthreatening way, which is why we have euphemisms and hide the fact of death and (extreme) evil for so long. All of that however is separate from whether we should teach religion, which is more or less orthogonal to objective reality. Religion covers that which is unobservable, almost by definition.