1Jn 2:2 He is the atoning sacrifice for our sins, and not only for ours but also for the sins of the whole world.
Nothing else appeases God's wrath on sin but Jesus' death on the cross. For "it was the LORD’s will to crush him and cause him to suffer, and though the LORD makes his life a guilt offering, he will see his offspring and prolong his days, and the will of the LORD will prosper in his hand." Is 53:10 And Jesus said, "But I, when I am lifted up from the earth, will draw all men to myself." He said this to show the kind of death he was going to die. John 12:32,33
God our Savior "wants all men to be saved and to come to a knowledge of the truth." 1Tim 2:4 Jesus died for the sins of the whole world. In preaching to non-Christians we should not say, "May be Jesus died for your sins and maybe he didn't. I don't know." We should not say, "Maybe God loves you or maybe he doesn't. Maybe he hates you so much he predestined you for eternal damnation and there's nothing you can do about it!" Rather we should say, "God loves you and wants you to be saved. Jesus died for your sins and he declares that if you come to faith in him, your sins will be forgiven." "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." John 3:16 Of course we'd want to elaborate upon what constitutes "faith in him.", but the point is that Jesus died for the sins of everyone around us - regardless of whether they ultimately end up in heaven or hell.