Satan active

Despite outwardly unremarkable appearance and seemingly good behavior, members of God's church may in fact work for Satan.
Satan can enter men.

Luke 22:3 Then Satan entered Judas, called Iscariot, one of the Twelve.

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The line between God and Satan can be crossed in a heartbeat, evidenced by two spectacular contrasting Scriptural phrases separated by only 5 verses.

Matthew
18And I tell you that you are Peter, and on this rock I will build my church,
23Jesus turned and said to Peter, Get behind me, Satan!

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I watched in horror as Satan drummed a church worker out of a congregation. The worker had nearly perfect Religion grades from MLC, but the worker had not graduated from MLC, so Satan entered and used "WELS Purists" to castigate the worker as an outsider and to create a hostile and abusive work environment. After years and many attempts to correct the situation, the "A" student resigned leaving "B" and "C" students to run the asylum. Satan does not want "A" students working in the church.