Need for God or the Concept of God
There is a theory that people came to need God or the concept of God as someone or some entity that could foresee the future.
People encountered vary many and various tragedies in their lives. They thought that if they had been able to see future, they could have avoided any tragedy. From farmers and hunters to kings of ancient nations, all people wished for such ability to foresee future. And even if they could not have such ability, they wished they could be helped by someone or some entity that has such ability. So, they discovered, invented, or dreamed of God or the concept of God.
In this context, God was created by men, but God did not create men.
As time went by or specifically in these 2000 years, the mankind has developed its civilization, science, and technologies and found various rules in various phenomena and incidents. Now men's ability has greatly expanded and their lives have been improved along with ability to predict future of various phenomena and incidents. People do not any more live in the world of phantoms, angels, devils, and other superstitions. Almost no people believe, for example, miracles depicted in the Bible. But major religions in this world do not go extinct.
Even people like to observe Christmas. Apart from the fields of science and technologies and social systems, people still cannot avoid major and minor troubles in their lives. They can still meet natural disasters, fall in unexpected illness, lose their assets, get involved in human conflicts, become victimized by criminals, etc. So, people understand value in observing Christmas. It also means that people know that science, technologies, and advanced social systems cannot still solve every human problem.
In other words, as long as there is uncertainty in one's life, one needs religion to conquer fear of possible tragedies.
However, the Gospels read that Christ Jesus said that when one rich man accumulated enough assets and said to himself that he could now spend the rest of his life, enjoying his riches, eating and drinking, God said to him that he was so foolish as his life would end that night.
Ultimately, until men develop science and technology enough to conquer death, religion will be required. Until then, people will continue to observe Christianity with respect for God or the concept of God.
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Joh 12:24 Verily, verily, I say unto you, Except a corn of wheat fall into the ground and die, it abideth alone: but if it die, it bringeth forth much fruit.