Simply test the ideas out by reading Scripture for yourself. Does the Bible say we're only "partially" sinful or "totally" sinful? Does Scripture teach that GOD is fully sovereign? Or do we determine our own destinies?
Regardless, it's not Calvinism that saves a person's soul. The doctrines of election and Divine Sovereignty are far secondary to that of faith and repentance. They're important, but not essential.
They have been, however, made a whole lot happier and more secure in their faith through the Calvinist perspective of the doctrines of grace.
Salvation is of the Lord. All of it.