They are not all completely different

[GoldfishLord]

There are currently about 30,000 Christian denominations in the world. They are not all completely different but clearly they are not all on the same page either.
Source: https://www.stphilipsdunbar.com/blog/epiphany-3-2016

They are not all completely different

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Could we move "all" before "are" as in "they all are not completely different"?

 

[Tarheel]

No, that would make no sense. "They are not all completely different" means there are differences between them, but there are also similarities.