Does anyone know anything about this church?

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Mark Nash

Was a recognised cult. "Was" being the operative word. Several years ago they publicly renounced their beliefs and repented and were for the large part, embraced, into the fold by many denominations. From what I've heard recently though, most COG fellowships never really changed.

They have a very strong emphasis on end time prophecy and believe/d they are God's Prophet on the earth.

It is also known as Armstrongism.

But why ask here? Just use Google and you'll find everything you'll ever need to know.