One has to wonder why you would want to!
However, religious belief does gradually seem to be declining in the world, so it seems difficult to try and stop Atheism growing.
Answer 2:
Atheism spreads when people know they can believe whatever they want to believe and also choose not to believe or be a part of. And atheism spreads even faster when there isn't much forcing people to believe in a certain way. Look at Islam and Judaism. They have very aggressive rules about how one should believe. Not conforming to those criteria could mean expulsion, community detachment and even death. You won't find many atheists there. But then look at christian communities, where there is a lot of freedom in what and how to believe. Someone who acknowledges to be gay or athiest doesn't really face harse consequences. You find many atheists here.
Atheisms is also directly related to our dependency on technology. The more advanced our understanding on nature becomes, the more we rely more on technology and science than on God. As you can see people is still debating the big bang theory.
So how do you prevent it !? The solution is to teach your children to be god fearing.
Squash them
The ideal way to prevent people from spreading any infectious disease would be to place them in a hospital and treat them, until they are cured.
People are immunised to prevent the spreading of disease
By covering your mouth with with the inside of your arm.
To prevent Communism from spreading.
We can cover our food to prevent the housefly from landing on the food and contaminating the food.
By spreading water
benign
To help prevent the spreading of bacteria and germs
By cleaning drinking water and washing hands with soap
to prevent hackers, to prevent the spreading of viruses etc
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