I think it is more accurate to say that he has paid the penalty for every sin. But in order to receive a pardon, you have to accept the terms of the pardon. The terms of salvation are that you must believe and receive. The pardon is there for the taking, but unless you abide by the terms of the pardon, you will be punished for your sins.
Why is there a condemnation for any man? Because the atonement is only effacacious to those who believe. Whosoever believes in him. But you can't get away from the prior term that God loved the world. All men were included in the potential for salvation, but only those who believe are entitled to claim the effect of that love. If-then. Those are the rules. Follow them.
Sufficient for all, effective for some.
the GRACE of God?
the efficacious act of the natural fallen MAN?