The United States has more tornadic activity than the rest of the world combined and church steeples just don't stand up to it.
On the other hand I don't believe I've ever seen any sort of Protestant church without at least one cross inside. Just guessing the "expert" hasn't been inside many Protestant churches.
For every church without a cross, how many of their cemeteries do you imagine might also not have a crucifix on any of their headstones or graves?