Wouldn't it be better for atheists to convert, so that they don't receive the wrath of God?

It is because of a deep seated and conscious willful denial that they will never admit to God's existence. No matter how much proof, or how eloquent your argument they will refuse to believe. They will cling to their science, which changes daily as in the fact that older (50's & 60's)school science books stated that the stars reflected the light of the sun and had no light of their own and that Pluto is suddenly no longer a planet.