Angels OR Demons in Disguise?

1 Timothy 4:1

“But the Spirit explicitly says that in later times some will fall away from the faith, paying attention to deceitful spirits and doctrines of demons,”

And why do people pay attention to these deceitful spirits?

2 Cor 11:14

“Satan himself keeps transforming himself into an angel of light.”

And what doctrines might these deceitful spirits be spreading?

Galatians 1:8

"But even if we, or an angel from heaven, should preach to you a gospel contrary to what we have preached to you, he is to be accursed!"

So a demon, disguised as an angel, would attempt to pervert the true gospel with a false gospel. Has this ever happened?

Islam got its start when at the age of 40 (610 AD), Mohammad started to receive revelations from God through the angel Gabriel.

Mormonism got its start when at the age of 18 (1823) Joseph Smith started to receive revelations from God through the angel Moroni.

Seventh Day Adventism got its start when during her lifetime Ellen White wrote more than 5,000 periodical articles, 40 books and reported over 2,000 visual/aural paranormal experiences, most of which she was convinced were communications with supernatural entities including various angels.

Jehovah’s Witnesses got their start when “certain duties and kingdom interests had been committed by the Lord to his angels, which include the transmission of information to God's anointed people on the earth for their aid and comfort. Even though we cannot understand how the angels transmit this information, we know that they do it; and the Scriptures and the facts show that it is done.” “Preparation” (a WT publication; 1933; p. 36-37)

“Without a doubt the Lord uses his angels to cause the truth to be published in the Watchtower. Certainly God guides his covenant people by using the holy angels to convey his message to them,” (WT, 1 Feb. 1935, p. 41.)

“Jehovah’s Witnesses make their declaration of the good news of the kingdom under angelic direction and support.” “Preparation”; 1933 p. 35-38

More recently, in 1987, the WT stated that their doctrine concerning Christ’s invisible return in 1914 was delivered by angels. (WT 15 Dec. 1987, p. 5)

Also in 1987, the WT claims that angels communicate information to them. (WT 1 August 1987, p. 19)

What can one conclude from these facts: (1) the WT states that they are receiving information on doctrine, etc. from angels but do their doctrines square with the Bible. The WT Gospel found here is vastly different when compared with the Biblical Gospel found here. The WT states that Jesus is not God but what does the Bible teach found here and here. The WT states that Jesus did not rise bodily but the Bible states that he was found here and here. The WT teaches that only 144,000 go to heaven. Compare that with what the Bible teaches on the subject found here. Lastly, would God use a False Prophet to teach his people Truth. Of course, the WT states that they are not a False Prophet. You decide by looking at just four of their many false prophecies found  here,  here, here and here.  These comparisons would lead one to conclude that the information the WT is getting is a lie thus coming from the Prince of Liars, the Devil, and his minions, Demons.