My personal religious standards are the biblical texts and the Book of Concord of 1580. As for the classical charter school we are attempting to found, its core knowledge sequence and curriculum will most likely cause the educated citizen to gravitate toward those standards, but they will not be overtly advocated. The gist of this effort is to turn public schools back toward the standards and processes they should have maintained all along. In this region there is only one overtly Christian school that follows a classical pattern in terms of its overtly Christian aspect, which is excellent. The Elkhart Classical Academy would not follow that pattern due to its use of public resources and adherence to public protocols which currently prohibit religious advocacy.
Wish I could cheer and encourage your endeavor, but "use of public resources and adherence to public protocol" are poison pills, imho.
As granny used to say, he who pays the piper calls the tune. Government will be calling the tune.
I understand that Indiana homeschooling laws are mild compared to my state (Pennsylvania, which has an atrocious set of standards to homeschool) but a charter school is accountable to the state dept of education.
Better than public school, to be sure. But expect that call from the gov't: "...and I'm here to help."