When we say, "I believe (in) X" all we are saying is that we are accepting that our understanding of "X" as correct (whether it is or not). So there is no reason why we couldn't choose to reverse that option at any time. And in fact, we all do so on occasion. We choose to no longer believe that our understanding of "X" was correct, and we adopt a new, changed understanding of it.
Those that claim they do not have a choice in the matter are only saying that because they have become "true believers" in the methods they use to determine an accurate understanding of "X" from an inaccurate one. They can't imagine that there might be any other better method, and so they cannot envision themselves ever choosing any other way. In their minds, and from their perspective, there is no other choice.
But of course this is untrue, as even the "true believers" do sometimes change their methods of determining what they believe. We know that, in fact, it can and does happen. Which then begs the question: why do we choose to believe in things at all given that we could always be wrong, and that our beliefs tends to blind us to that reality? Given the inevitability of error, why do we believe in anything? Why not just allow what is apparently correct and accurate to stand as correct and accurate until we discover otherwise? Why presume that we ever get it right?
I'm pretty sure the answer is that our ego demands it. But why did we ever develop such a cognitive mechanism as ago? What essential service does it provide us cognitively speaking?
I'm curious.