Well, it took me a while to find it but I did. There is a spirit of error and then there is false teachers. A person can misunderstand Scriptures and teach on one thing erroniously, but if he is doing this to gain your money, I would say he falls under the latter. He sounds like he's getting into, or has already gotten into that new wave, little gods doctrine hitting the churchs after the charismatic movement.
This is Paul speaking to the Corinthians about false teachers and it ain't pretty. I will give you a few exerpts from the chapter in the Amplified. You may use this when you speak to your friend.
He speaks of first, their spiritual condition and what they are about spiritually and then he speaks of practical matters in the physical.
II Cor. 11:3,4
"But [now] I am fearful, lest that even as the serpent beguiled Eve by his cunning, so your minds may be corrupted and seduced from wholehearted and sincere and pure devotion to Christ.
For [you seem readily to endure it] if a man comes and preaches another Jesus than the One we preached, or if you recieve a different spirit from the [Spirit] you [once] recieved or a different gospel from the one you [then] received and welcomed; you tolerate [all that] well enough!"
In v. 14 "And it is no wonder, for Satan himself masquerades as an angel of light:"
v 19,20 "For you readily and gladly bear with the foolish, since you are so smart and wise yourselves!
For you endure it if a man assumes control of your souls and makes slaves of you, or devours [you substance, spends your money] and preys upon you, or decieves and takes advantage of you, or is arrogant and puts on airs, or strikes you in the face."
This is what I have seen many false teachers do. Also, read II Timothy 3.