Baxter mentioned Atheists?

Certainly the Atheists of 1691 were those "against God" not those that do not believe in God.

And to see devils and other spirits ordinarily, would not be enough to bring our Atheists to the saving knowledge of God, without which all other knowledge is vain. They that doubt of a God (the most perfect, eternal, infinite being), while they see the sun, and moon, and stars, the sea and land, would not know him by seeing created spirits. ~ Richard Baxter The certainty of the world of spirits fully evinced -1691[1]