That's why we are to preach the gospel, so people have the opportunity to hear it so they can choose to believe it.
No man will choose to respond to the Gospel unless God works within Him. Man is dead in trespasses and sins.
Absolutely. Anyone can choose to believe the gospel.
If so he has done something to earn salvation.
Yes. He has decided to believe. That's what you did at some point.
He has not received it as a free gift.
Of course he has. So did you, when you chose to believe.
But I did not choose to believe. God brought me to believe.
God does not force salvation on anyone. He wants all men to choose to believe.
Calvinism is not true.
God did not, and does not, determine who will come to Him for salvation.