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That’s the fruit of Calvanism.

True.
Calvinism confuses justification and sanctification. The result is a Calvinist salvation which involves works and more works until one's death. Even then the Calvinist is not assured of his salvation. This Calvinist confusion inevitably marginalizes Christ's completed work at Calvary and puts a large measure of propitiation onto the "believer's" shoulders.

Subsequent growth and maturity in Christ after a person is saved (sanctification) does require changes. The believer has been born-again and is able to walk in the "newness of life." A saved believer has the indwelling Spirit and Scriptures to grow in his understanding of Christ and resist temptation. If he fails by sinning, he has the remedy of I John 1:9.

As to a person's salvation by faith Christ's explanation to Nicodemus prior to John 3:16 laid this all out. Christ used an incident in the Book of Numbers to illustrate it. Many of the complaining and implacable Jews were being punished by the Lord were now suffering after being bitten by a lethal snakes in the desert wilderness. As a remedy God responded to Moses' plea by having the construction and raising of a brasen serpent in the middle of the camp. The remedy was that an afflicted Jew merely looked upon it to receive the cure. Thus, it was a simple belief apart from works. Christ suggested that this foreshadowed the cure his raised cross would offer mankind. He then finalized His argument with that well known Gospel passage.

For God so loved the world that he gave his one and only Son, that whoever believes in him shall not perish but have eternal life.