While these two forces are currently allied against Judeo-Christian traditions, they are, in fact, quite different.
Naturalists are avowedly pro-nature.
Some of them embrace nature in a genuine way, spending much time in the wilderness. Others are city dwellers, and their only communion with nature takes place in their imaginations. For they know no woodcraft, and often leave behind piles of trash. Naturalism developed well before science, hence, its roots are rather fuzzy. In the distant past there was no clear, mental dividing line between the natural and supernatural, or even between the explicit and the metaphorical.