Why so?
@JAL, operating off of his condensations of Calvinism, neglecting not just the finer points, but the means, the mindset, behind it, introduces his own mindset into his already biased point of view. He wants the big picture, the end of reasoning on it, and so he jumps to conclusions, as judged by his mindset, or by his basic assumptions. He see God doing part, and God's free moral agents doing the other part. Cooperation, as if we have something to contribute to improve what God does. Synergism says the same thing about Salvation. But the same principle applies in every subsequent virtue and obedience. He doesn't seem to understand what "in Christ" means.
If Salvation is entirely of Grace, in the way that Calvinism claims, where even the choice for Christ is done subsequent to regeneration, EVERYTHING the believer does obediently is compelled upon him by the Spirit of God. There is nothing there done automatically. The criticism is so predictable that it is nearly possible that everywhere the anti-Calvinist scoffs, "Why? —After all, isn't it automatically going to happen with or without you?", the word, "automatic" could instead be replaced with "surely". It is surely going to happen, precisely in every detail as God planned, and if I'm disobedient, God will use that to further his plan, but woe to the one God uses that way! If, instead, I obey, and God uses my obedience to further his plan, I have joy and satisfaction in him. I certainly have choice in the matter. And God certainly will accomplish all he set out to do. And if I obey, I continue in him. But if I disobey, what reason do I have to even claim to be "in him"?
This argument I keep hearing, that there is no motivation for the Calvinist to do anything, is spoken by those who despise Calvinism, and don't understand it. It is one thing to say that one doesn't understand how the Calvinist has any motivation; it is another to say the Calvinist has no motivation. The scoffer has no sense of propriety. He doesn't understand how big a difference there is between God and creature, and how close the relationship is where God does not "give orders" that he doesn't also work in us to carry out, and where "the orders" are joy, and life is Christ.
I am not nearly far enough down this path to be able to describe it adequately. I'm sorry if I don't know how to get the intellectual explanation done. But the Bible says several very remarkable things, if walking in the light depends on libertarian freewill,
"For it is God who works in you both to will and to do of his good pleasure." & "Apart from me you can do nothing.", are two of my favorites.