Sometimes I wonder to what extent belief is essential. For example, if I never believed I could learn to swim, it seems very unlikely that I would have learned to swim. For me, I think belief that it was possible was necessary in order to give it enough of a try, and to persevere long enough to be able to swim. Initially, poorly, and not for very long. But maintaining belief in my ability to increase swimming proficiency, I continued to practice, and continued to improve. Now I can appreciate many fun activities where swimming is required. If all I could do was drown in the water, all those fun activities would not be fun at all. Even if I saw other people having fun in a wave pool, I would be drowning and having a bad time from the perspective of not being able to swim. Knowing how to swim, I can experience first hand the joys of a wave pool (or water polo, snorkeling, etc.). Then there's a feedback loop where having enjoyed it, I'm more inclined to do more of it, which would improve my skill, and lead to more enjoyment.
I think that applies to more than just swimming. Perhaps all skills that take time and effort to develop, require belief. Some things we just learn through exposure and unwanted repetition, and so wouldn't require belief at all. But I hypothesize that religion is one of those areas where belief is required to experience the benefits, and that the more practice we have, the more we can appreciate. Also, that belief can be cultivated, and destroyed, depending on how we think. We can exert effort to generate a stronger than normal belief for a short while, and just see what it's like. Similarly, we can exert effort to reduce our belief about a certain thing for some time. Through sustained regular effort, our normal equilibrium of where we naturally tend to believe can be altered. Because of this, I think it is very difficult for athiests and the religious to understand one another.