Carl Sagan talks about Mediumship/Channeling and Astral Projection on the Flat Earth
Channel: THE EARTH IS FLAT!!
Date: 2017-05-03

Deuteronomy 18: 9 “When you come into the land that the Lord your God is giving you, you shall not learn to follow the abominable practices of those nations. 10 There shall not be found among you anyone who burns his son or his daughter as an offering,[e] anyone who practices divination or tells fortunes or interprets omens, or a sorcerer 11 or a charmer or a medium or a necromancer or one who inquires of the dead, 12 for whoever does these things is an abomination to the Lord. And because of these abominations the Lord your God is driving them out before you. 13 You shall be blameless before the Lord your God, 14 for these nations, which you are about to dispossess, listen to fortune-tellers and to diviners. But as for you, the Lord your God has not allowed you to do this.

Proverbs 6: 12-14 
A worthless person, a man of iniquity, Is he that walketh with a perverse mouth;
That winketh with his eyes, that speaketh with his feet, That maketh signs with his fingers;
In whose heart is perverseness, Who deviseth evil continually, Who soweth discord.

Ephesians 6:12
For our struggle is not against flesh and blood, but against the rulers, against the powers, against the world forces of this darkness, against the spiritual forces of wickedness in the heavenly places.

Masonic hand signs are used by spirit mediums when the're channeling demons. 
Please watch this 5 part series to learn more.
Part 1 - https://youtu.be/tkhQ9Ot5F6c
Part 2 - https://youtu.be/mkmJ8LjkHMY
Part 3 - https://youtu.be/dQGwuVumnVk
Part 4 - https://youtu.be/xZtfApExaI0
Part 5 - https://youtu.be/yu1THqilleU