If those luminaries were alive today, they'd be considered deviant by your standards.
In fact, Al-Ghazali played role in the decline by saying that 'falsafa' was incompatible with Islam.
He shut them down in "The Incoherence of Philosophers" in an attempt to steer civilisation back to Islam. He succeeded.
A lot of people equated their achievements as Islamic, like we still do today, thus why Al-Ghazali came in to separate one from the other.
Especially when a lot of these scholars were considered freethinkers at best.
Thank you to those who have shared with me links/articles that explain otherwise. I really appreciate it.