I'm not sure what you mean by "knowing for sure". Do we know anything "for sure"? Do we have absolute certainty that any of our beliefs are accurate? I doubt it.
Lets say, the same degree of certainty with which you would be prepared to send someone to life in prison. Christianity after all, tends to dictate how one should live their life, often takes up much time in ceremonies, and can occasionally result in war whilst trying to defend the belief. I would suggest you need to be as certain about this as much as you possibly can.
But even then, there's only two choices. Either we choose to trust God in the face of uncertainty or we choose to effectively deny him.
But there is the position before you make the choice. I'm saying that no one has sufficient evidence or reason to make that choice responsibly.
"I'm not sure" isn't a complete answer. No one is sure - Christian or non Christian. Christians say: "I'm not sure but I'm going to live as though this is true and trust God." Non Christians say: "I'm not sure but I'm going to live as though is not true and not trust God." We either life in faith or unbelief.
That has seldom been my experience. Christians seem to be most sure about their belief. Some to the extent that they will die for it.
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