No - it's b/c these Christian groups saw how The Shack did NOT line up with the bible at all. It's no different, from let's say, Billy Graham and Rick Warren - alot of what they say are heresey, which is why both are false teachers.
Galatians 1:6-10 - "I marvel that ye are so soon removed from his that called you into the grace of Christ unto another gospel: which is not another; but there be some that trouble you, and would pervert the gospel of Christ. But though we, or an angel from heaven, preach any other gospel unto you than that which we have preached unto you, let him be accursed. As we said before, so say I now again, If any man preach any other gospel unto you than that ye have received, let him be accursed.
For do I now pursuade men, or God? or do I seek to please men? for if I yet pleased men, I should not be the servant of God".
Galatians 6:7-8 - "Be not deceived; God is not mocked: for whatsoever a man sowest, that shall he also reap. For he that soweth to his flesh shall of the flesh reap corruption; but he that soweth to the Spirit shall of the Spirit reap life everlasting".
1st Timothy 4:1-2 - "Now the Spirit speaketh expressly, that in the latter times some shall depart from the faith, giving heed to seducing spirits, and doctrines of devils; speaking lies in hypocrisy; having their conscience seared with a hot iron;"
2nd Peter 2:1-2 - "But there were false prophets also among the people, even as there shall be false teachers among you, who privily shall bring in d@mnable heresies, even denying the Lord that bought them, and bring upon themselves swift destruction. And many shall follow their pernicious ways; by reason of whom the way of truth shall be evil spoken of".
The Museum of Idolatry: The Shack's False Godhead