The guy who wrote the song, (the guy singing it in the vid), wrote it to counter the fear and indoctrination his children were getting from their school, in particular the school chaplain. He is lobbying to get chaplains out of schools, or to limit what they can teach in schools, and who they can teach it too. I love the song, its very catchy. My Grandkids love all the animals :)
This is another little vid from the same guy, to help kids deal with the religious propaganda they see around them daily.