In my experience in discussing and studying Calvinism: All forms of Calvinism promote the idea that it is ultimately God who saves you and it is in nothing that you did. A person is saved by election or by some kind of regeneration before they exercise faith in the gospel. Many Calvinists believe (from my understanding on Calvinism) is that they consider our free will choice to exercise faith as a work, and thus God needs to save us by His grace and change us. God saves us, and we do not make the choice to be saved (in the world of Calvinism). Some in Calvinism say that “Calvinism is the gospel.”
This is not what I believe the Bible teaches. I believe the gospel is the power of God unto salvation to all who believe. The gospel is defined for us in 1 Corinthians 15:1-4. The gospel is believing that Christ died for us, that He was buried, and He was risen three days later on our behalf for salvation. This is the gospel upon which we are saved. This is how we first get saved is by believing the gospel by faith. We are not saved before this point by the grace of God or by Him zapping us or regenerating us to be saved. We exercise faith in the gospel and then we are saved.
I will try to refer here to Reformed Theology, instead of Calvinism, though they should be the same thing. The problem is that "Calvinism" carries a lot of baggage and bias against it that I would rather avoid. I have heard all sorts of things, from "Calvinism teaches that we have no choice" to "Calvinism teaches that we are robots." It does no such thing.
Many, maybe most, people who are not of the Reformed persuasion don't really understand what they have heard, nor even what they have studied concerning Reformed Theology. You say "...Calvinism promote the idea that it is ultimately God who saves you, and it is in nothing that you did." You are a bit vague, there; truth is, pretty much ALL Christianity teaches it is ultimately God who saves, Arminians included. None of them wish to remove credit and glory from God. The problem comes when Reformed Theology wants to remove credit and glory from Man. Common Christendom seems to assume a man's decision is not real if it is in some way caused by God. Reformed Theology insists that a man's decision is not real unless it is caused by God. "Without me you can do nothing."
One of the most common misunderstandings of Reformed Theology has to do with the use of the word "saved". The term should mean either "saved from sin" or "saved from damnation" and usually means both, but Christendom has turned it into a state of being that only regeneration accounts for. Reformed Theology tries to be specific as to exactly what one is talking about: Conversion happens at regeneration, which is by faith, which is the gift of God, not the work of man. Regeneration then, is not a decision --it is the change made by the Spirit that God has placed in you.
Your vagueness also shows here: "...and it is in nothing that you did." --WHAT is in nothing that one does? Salvation? Regeneration? Do you see here how the point of just what is meant by "Salvation" is important here? But what do you mean by "in" nothing that one did? As a result of what one did? Does it mean that what one did (presumably, you mean believing, or maybe even "accepting" Christ (whatever that means --receiving?) according to Calvinism, has no effect upon one's regeneration and forgiveness from sin? Or does it mean that if one is regenerated by God alone, the believing, (repentance etc) is irrelevant and need not even happen? For what it is worth, Reformed Theology teaches that believing, (repentance etc) MUST follow, MUST happen, or the regeneration never happened.