Quoting Mama MacGyver*:" <blockquote><b>Quoting Dovahkiin:</b>" What are the songs? Are they actually about ... [snip!] ... are specific prayers. God, Jesus, let us thank our lord, praise our lord, those type of things. No sort of lessons involved."
Yeah, that's definitely not their place if they aren't supposed to be directly a religious preschool. Talk with the director and ask for it to stop, teach him other songs instead.
There are plenty of songs out there that don't involve religion, they have plenty others to choose from.