A pantheist may believe in Law of Nature and go no further; a theist who accepts Law of Nature has a large instalment of natural theology ready made to his hand; including an idealist, or else an intuitionalist, scheme of ethics.
Or a pantheist rejecting theism altogether.
Whether Xenophanes was a monotheist, whose assertion of the unity of God suggested to Parmenides the doctrine of the unity of Being, or a pantheist, whose assertion of the unity of God was also a declaration of the unity of Being, so that he anticipated Parmenides - in other words, whether Xenophanes's teaching was purely theological or had also a philosophical significance - is a question about which authorities have differed and will probably continue to differ.
The term "pantheist" was apparently first used by John Toland in 1705, and it was at once adopted by French and English writers.
Spinoza is, therefore, both pantheist and pancosmist: God exists only as realized in the cosmos: the cosmos exists only as a manifestation of God.
But he was no atheist, for the pantheist Zeno spoke highly of him.