I'm Agnostic, Anti-religious, But still believe 'God(s) should be taught in schools. mostly, for the benefit of healthy skepticism.
This is where ideology runs into practicality. I would wholeheartedly agree that any well-rounded education should include learning about world religions, but there is no practical way for this to happen in public high schools without angering a significant portion of parents. Jimmy's uber-fundie parents will not be happy about Jimmy learning about Buddhism.
Science didn't kick a Comparative World Religions course out of high schools. Christians did.
Re: it would be a good things for society in general
If that was all that was needed to get the offened parents to pull their little darlings out of public schools and ship them off to some more Avoidance Schools maybe the education system in the US could make great leaps forward.
What I fear is a society with more anti-vaxxers, climate deniers, and the like. However, school tuition and/or home schooling are beyond the means of many fundy families, so maybe we shouldn't worry too much. If anything, these are reasons to vote against school vouchers for charter . . . I mean avoidance schools.