Faith expression and music go hand in hand. John Wesley thought it so important that he wrote a list( a long list) of important requirements.
So I thought I would run through a few Christian Australian musicians making children’s music.
Colin Buchanan numerous see https://www.koorong.com/c/music/childrens-music
J for Jesus by Emu Music https://www.koorong.com/search/product/j-is-for-jesus-emu-music/9331213000305.jhtml
or Get Ready https://www.koorong.com/search/product/get-ready-emu-music/9331213000213.jhtml for the slightly older crew
Snack Music https://www.snackmusic.com.au
Sean Smith https://seanwsmith.com
or more mellow try Heather Price http://heatherprice.com.au/live/
Have fun finding the style that suits your family/ies best.
Let me know of others so we can expand this list