Satan and his angels were cast to the earth so guess where they conduct their work at? They are in the pulpits of the world; what better place to perform deception, than from the head of the churches of our land.
“But if our gospel be hid, it is hid to them that are lost. In whom the god of this world hath blinded the minds of them which believe not, lest the light of the glorious gospel of Christ, who is the image of God, should shine unto them” (Corinthians II 4:3-4)
Some preachers pretend to be messengers of light but in reality they are angels of darkness.
“For such are false apostles, deceitful workers, transforming themselves into apostles of Christ? And no marvel; for Satan himself is transformed into an angel of light. Therefore it is no great thing if his ministers also be transformed as ministers of righteousness; whose end shall be according to their works” (Corinthians II 11:13-15)