The gospel is "the power of God unto salvation to every one that believeth" (Rom. 1.16). This is a conditional statement. If you "believeth" you will receive "salvation" (redemption and eternal life).

The Calvinist comes along and changes this to mean first a person needs to be regenerated then they can believe to be saved. So to the Calvinist regeneration and salvation are not the same thing.

The word "regeneration" is only used once in the Bible pertaining to individual salvation.

"According to his mercy he saved us, through the washing of regeneration [our new birth] and renewing of the Holy Spirit" (Tit. 3.5).

How strange it would be that God regenerates us, giving us a new life, yet we are not saved.

Do you see how the Calvinist can change the meaning of words for their irresistibly imposed salvation?