I would not consider the Visits to . . . series to be “overtly Christian,” Alyssee123. It is mostly map drill and taking a peek at families who live around the world, featured in Material World and Hungry Planet (neither of which is a Christian book). Additional living books are recommended that are representative of various regions, which you can use at your discretion. They’re optional.
Hopefully, the series will make your life a bit easier. 🙂