When I became a Christian in 1974 I had a voracious appetite to learn as much as I could about my new faith and the beliefs of those who challenged it.
I read the book "Death of a Guru" in about 1977 when it was first published.
It is still in print.
It opened my eyes to the spiritual world that is in opposition to Jesus.
This link is to a talk by its author.
He was brought up a as Guru and then Jesus broke into his life.
I recommend anyone searching for truth buy the book which Rabi mentions in this talk and please watch the video..