It makes no more sense to claim that Newton was a creationist than to assert that Moses wasn't a Christian. I've seen the long lists of famous creationist scientists. For some reason, all but a handful were dead before 1900. Must have been assassinated by the evo conspirators.
Interestingly, for all these alleged "scientists" who have embraced creationism (or it's stealth version, ID), there is not one single example of anything ever brought forth by "creation science." Sure, there are numerous religious scientists, but the doctrines of "creation science" are sterile.
Consider: The biotech industry is large and growing. They employ maybe 100,000 scientists. They want results. I've not yet heard of a single creationist who was hired to do biotech research.