When I was a child, I assumed people chose what they believed. Then I grew up.
Here is the problem:
1. Our senses are not entirely accurate. Our eyes, ears, etc., don't always work the way they should and there are many things that exist for which we have no ability to sense.
2. Our perception is not completely reliable either. Perception is the ability to properly interpret sensory data. Even if our bodies are functioning as designed we make mistakes. Optical illusions are well known, as are hallucinations, and these things are far more common than people want to think. Do you realize just how common it is for people to not quite hear a word, and insert the wrong word into the blank spot?
3. Contrary to popular thinking, human beings are incredibly irrational creatures. We have inherited biologically ingrained cognition errors that literally block us from reaching accurate conclusions: confirmation bias, primacy effect, projection, need for closure, illusion of control.... I could probably list 30 different cognitive distortions that keep us from the truth.
IMHO, it's a miracle that human beings can function as well as we do.
Do I think we have a moral imperative to try to find the truth? Yes. But I would say we have just as strong a moral imperative to humbly realize just how fallible we are, and to extend grace to those who are "wrong," because after all, that wrong person could be us.
I am not Christian, and quite frankly I find the Christian notion that God will eternally reward or eternally torture someone due solely to their honest errors seems morally outrageous to me. It would be the worst sort of injustice to punish a person for something that is beyond their control. And folks, that's just not the God I love and serve.