I see no explanation why you would call a man of God a heretic? Maybe you should understand what it means to deny the power of the Holy Spirit; the Baptism of the Holy Spirit!
https://www.biblegateway.com/blog/2012/10/what-is-the-unforgivable-sin/
What they are doing could be a sin against the Holy Spirit, but the worst blasphemy was in Jesus' time when the scribes and Pharisees accused Jesus of casting out demons by Satan's power. To which Jesus replied: "Wherefore I say unto you, All manner of sin and blasphemy shall be forgiven unto men: but the blasphemy against the Holy Ghost shall not be forgiven unto men." Matthew 12:22-24, Mark 3:22.
Rodney Howard Browne CNN Interview - "Holy Laughter" - EXPOSING CHARLATANS - youtube
I know it's CNN but even a broken clock is right twice a day as the saying goes.
I'm sorry for you that you've been deceived by people like this and Benny Hinn and a whole lot of others.