God doesn’t mind even atheism provided the justice is maintained in the society
If God and hell are not accepted, the sin will grow to climax

Miracles only prove the existence of unimaginable God. Anybody including the demon demonstrating the miracles is in the service of God to establish the existence of God to an atheist. Miracles exist widely with God in human form, devotees and even evil demons. Establishment of existence of original unimaginable God is the fundamental subject that needs wide publicity and hence God has spread miracles in wide range. Once the existence of God is accepted, the atheist becomes theist. This is the foundation step.

Even Shankara spent all His life in the first step only to convert atheistic Purvamimamsakas and Buddhists. Existence of God is needed even to establish Pravrutti through creating fear for hell. If God and hell are not accepted, the sin will grow to climax in a slow and steady way. Atheists promise to follow justice even without faith in God, but such promise is not having strong basis and it can be violated at any time. God doesn’t mind even atheism provided the justice is maintained in the society. But there is always a possibility of violation of justice if the hell disappears from the mind. When you are provoked to do injustice, at least the concept of hell and God will control you to certain extent. At least the percentage of people committing sins will be reduced. Of course, the concept of God and hell is not bringing the percentage to Zero, but if that concept is totally absent, by one day or other the percentage will be hundred.

For this point only, God comes down to establish His existence and there by create the fear for hell so that at least the percentage of sin and injustice comes to a minimum level, though complete eradication is impossible. God is not at all bothered to establish Himself for the sake of Nivrutti. If the society runs completely on justice, He will not mind even if all the human beings are atheists.