Christ said “whosoever”, I like Christ, you like Calvin, so be it.
I like Christ as well. He also said:
John 6:65 And He was saying, “For this reason I have said to you, that no one can come to Me unless it has been granted him from the Father.”
John 15:16 “You did not choose Me but I chose you, and appointed you that you would go and bear fruit, and that your fruit would remain, so that whatever you ask of the Father in My name He may give to you.”
You are referring to John 3:16, right?
If so, you are incorrect. Jesus did not say this. What He did say was, "Everyone believing . . . "
And people do not believe because they do not belong to Christ; they are not given to Him by the Father, therefore, they do not know Him nor hear His voice, nor believe in Him (John 10:26; 17:2, 6, 9). Notice especially 17:2, "that to all whom You have given Him, He may give eternal life."
And do not say that the Father has given all people to Christ unless you also believe in universal salvation. Remember Christ also said that everyone that the Father gives to the Son will come to the Son, and of all that come to Him, He will lose none of them, but will raise all of them up on the last day (John 6:37, 39) He repeated this promise again in verse 40.
I hope this helps you to see that salvation is all of God, all of grace. It is even God's work that you believe, He is the cause of your belief (John 6:29)