Atheists, Agnostics, and others, either consciously or subconsciously, have habituated themselves to thinking of God as some sort of adversary, and to his followers in Christ as enemies. As an atheist, try to catch yourself doing this and you will see that its true.
But nothing about God could be further from the truth.
God loves Atheists and Agnostics so much that many Christians, if they discovered how much, would be scandalized by it!
The true reason that they will not acknowledge God is far from 'intellectual freedom." To acknowledge the existance of God they must say that they were wrong. Pride of their life prevents them from this admission.
Therefore we must beg them to seek true humility.
many have adopted a sinful lifestyle which they refuse to change or in any way alter. They wrongly think that God wants them to change every little imperfection all at once. This is not the case. God wants them to change gradually, little by little, until they are ready to give themselves full to God.
Even those believers who call themselves "saved" as if their relationship to God were based on some sort of contractual moment, and who think that they were saved because they went up to "the altar call," ....are not saved, but they must continue to work towards salvation.
God does not look with more favor upon believers than unbelievers, but he doles out good things to both, hoping that the believer will improve himself and expecting much from him, and hoping that the unbeliever will repent of his unbelief and begin to live in Christ.