In general, Orthodoxy does not teach that everyone has grace as if it were the same for all. It teaches that the entire world is being imbued with the uncreated energies of God. But on the unbaptized it works from without, whereas in the Orthodox it works from within. The unbaptized do not have the faculty to receive sacramental grace, and if they were to receive it, they can become sick (spiritually and physically, cf. St Paul's Letter to the Corinthians).
I would read St Nikodemos's On Frequent Communion to further elaborate as to your specific question.