Our children are going to be exposed to many differing theories during their lives and it's a good idea to ask them what they think about each issue and then discuss calmly your own family positions.
You cannot prevent your children from hearing and/or seeing opposing viewpoints.
That's what I do with my kids
Mine attend catholic school .. and though I am happy with the school .. some of the information in the text books (which has to be approved by the state) I question how it is presented and let my girls know what I think
Like in my one daughter's social studies book where it compared our country's revolutionary war with England to the "Peaceful" Revolution it took Canada 265 years to achieve
Oh and then there is the "new math" (also required by the State) on quessing an estimated number