Why don’t you identify what you believe the author used as the ‘criteria’, then we can discuss your problems with it.
He described them in criticizing the survey by Barna Research.
1) 60% believe “that Satan ‘is not a living being but is a symbol of evil.’”
2) Only 25 percent strongly disagree that God the Holy Spirit is “a symbol of God’s power or presence but is not a living entity.”
3) Less than one-half of Christians strongly disagreed that “Jesus Christ sinned when He lived on earth.” (Actually this one I believe is in conformity with Christian doctrines, i.e. Jesus was sinless. So half of Christians would be in error.)
What I was criticizing was mostly #1, because beyond what is written in the Bible about Satan, people not only don’t know, but we are not even capable of finding out on our own. It is not up to us to define angels, in heaven or fallen.
And #2 is even worse, because trying to come up with a human description of God the Holy Spirit actually violates a commandment.