“Jesus never called a human being a sinner.”
He may not have used the word, but Jesus did point out to certain people that they were on the wrong path. Once, an encounter ended with “Neither do I condemn thee: go, and sin no more. (John 8:11)
I think I read most, if not all Schuller’s books during the late 1980s and ’90s.
He appeared to be a gentle soul and could weave tales that inspired and taught.
Mitigating Chaos 
I have actually never heard him or read his books. He grew up in a town about 10 miles from where I grew up.
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