A person can will themselves to believe in God, but such belief requires a lot of energy and focus just to be maintained, and sooner or later the person will give up, unless they find a reason to believe in God that makes it seem worthwhile to believe in God.
I don't think it's possible to believe in God. Rather, I think it's only possible to believe in the general 'idea' of God. As much as some people would have us believe that all conceptions of God are essentially a glimpse of the same thing, ultimately what everyone is doing is projecting their own particular visualization onto a generic metaphysical template. In other words, apart from a small list of essential qualities (and even those can be points of contention among believers) the details are always different.
Let's consider what is required in order to establish that we are referencing a particular person. We can give a name, of course, but names are generally not unique to a particular individual. Next we might reference their location, but even in a relatively small suburb there's a good chance that we will find multiple people who go by the same name. Finally, we might describe their specific characteristics. We could detail their personality, state where it is that they work, name some of their acquaintances or chronicle some things of note that they have accomplished. At this point there's an excellent chance that we have established who it is that we are actually talking about.
The problem with theism is that it falls well short of this. Theists are, collectively, referencing different entities. For example, if I told you that my friend John was a guy whose son had died in a skydiving accident, you'd know that I definitely wasn't talking about your friend John who had never had any children, right? Similarly, when a Christian talks about a god whose son died on a cross, we know they are definitely not talking about Allah, who never had any children. And that's just a single example, among countless others. God, as a person, is no more objectively real than a fictional character in a story. So for a theist, not only is it like the ultimate long distance relationship, it's also essentially like trying to have a relationship with the generic idea of a person, onto whom you've projected your own preconceptions. This is true whether God is real or not.
Energy and focus indeed.
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