When God chose to allow the sacrifice of his only son, he didn’t care if we were believers or non-believers.
Because God loves us so much he knew that our salvation was paramount not only to understand who he was but to allow us to be born again and redeemed ourselves so that we would be able to stand beside him on the day of Judgement.
He also knew that some were going to deny him and that is why in the book of Psalm 14:1 The fool hath said in his heart, There is no God. They are corrupt; they have done abominable works; none doeth good.
Those that are denying the existence of God are doing so because their moral and ethical values are non-existence. For them to commit evil acts, they cannot believe in a divine being that they have to answer to, so they choose the path of the Devil which is a road full of fornication, betrayal, hatred, jealousy and envy.
We cannot deny God and believe in Jesus because the word of God says in Luke 10:16 He that heareth you heareth me; and he that despiseth you despiseth me, and he that despiseth me despiseth him that sent me.
Neither can we deny Jesus as the book of Luke 12:9 But he that denieth me before men shall be, denied before the angels of God.