No, they are basing the belief on Pascal's wager (or if you prefer Pascal's gambit. The wager is quite a good example of a non-zero sum game, with obvious consequences for those who don't believe in G-d. You can also look at this as the Prisoner's dilemma, with the least punishment for the least effort going to those who believe in G-d. The other side of this is the moral solution to non-zero sum games. In this case the belief in the divine allows us to solve non-zero sum games (the prisoner's dilemma if you prefer) by either divine intervention (which isn't really much of a reality today... we don't see G-d coming down and telling us not to do something) but we do see the moral code of "do unto others as you want done to you" and "love your neighbour as you love yourself" as two solutions to non-zero sum games that involve belief in the divine and the moral code that is so associated. The problem that we sometimes see in our lifetime are those people who seek to selective choose the laws and morals that they wish to follow and worse to impose on others. For example, people who judge others when clearly we are morally told not to. And those who don't follow the rule of "love your neighbour" which clearly doesn't have exceptions and doesn't allow you to pick and choose (example, Rev. Fred Phelps who preaches hatred instead of love and violates the basic precepts of Chrisianity.)