Baloney. The ACLU objects to any teaching about Christianity, and has for decades. The ACLU objects to any representation of Christianity that can be seen from a public space, even one that is entirely privately funded and on private land.
Liberals are often mocked for being ignorant of anything outside their bubble. Thanks for demonstrating that. Oh, and it's Republicans that are labeled by "objective" journalists as "the stupid party", not conservatives. Think you'd know the difference by now.