Fully half of his life was wasted on theological bullshit. Imagine what he could have contributed if this cancer on humanity hadn’t been force-fed to him since he could speak.
There were actually metaphysical materialists similar to Machiavelli in Newton's time who were paragons of something similar to atheist thought and were free of " this cancer on humanity". But it's telling that none of them ended up developing anything of worth in the natural sciences and anyone who knows their philosophy would know why that's the case.