Calvinist/Reformed doctrine, like many other doctrinal systematics, is not perfectly monolithic in the degree to which its proponents hold to every doctrine. There are hyper-Calvinists who adhere radically to determinism and there are soft Calvinists who would only adopt two or three of the "petals" of TULIP and embrace, however inconsistently, notions of human responsibility. In general, though, serious Calvinists adopt either deterministic or compatibilistic (soft deterministic) views of human decision-making which creates some serious logical problems for them and contradicts those places in Scripture that indicate human free agency. For many Calvinists, the answer is to claim, not logical inconsistency, but "mystery," which is code, I think, for "our systematic has insuperable problems we don't want to admit are problems."
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