Let no one say when he is tempted, "I am being tempted by God," for God cannot be tempted with evil, and he himself tempts no one. (James 1:13)
Actually and honestly, this passage in no way "refutes the claim that God is the author of sin;" it only asserts that God does not tempt man to sin, quite a different implication entirely.
As for the WCF, such is not scripture, and thus such cannot be held to as a scriptural refutation. [Resorting to catechisms and other non-biblical works as infallible defenses {something I have gathered is very much the norm among those of the reformed faith} somehow, mayhap ironically, seems very Catholic indeed, does it not?]
