I’m not sure how you come to that conclusion. I do not assume that at least two people must agree on the answer to a religious question, for that religion to be ‘true’; in the same vein, I do not assume at least two people must agree on the answer to a physics question for that physical theory to describe reality.
Even informally, just because people disagree, does not mean everybody is wrong.
There is a saying I learned in shul, ‘two Jews, three opinions’. Many religions have a history or tradition of theological debate and disagreement, but so far as I can tell, Judaism has a unique tradition of arguing with God. Major Jewish prophets tried to reason with God or implied that His proposed acts would be unjust, just to list a few, Abraham’s plea to spare Sodom/Gomorrah, Moses’s plea to spare the idolators, and of course Job.
There is one particular story where rabbis are debating whether a new form of pottery is ritually pure according to halakha (Jewish religious law). Rabbi Eliezer cannot convince the Sanhedrin (council of rabbis/elders) that his interpretation is correct. He calls on God to prove him right, and after a series of miracles fail to persuade them, God directly tells the rabbis that Eliezer is correct. The rabbis then rebuke the word of God, saying it is for man to interpret the law: lo bashamayim hi, ‘it [the Torah] is not in heaven’.
The name Israel, after all, means ‘contends-with-God’ (Jacob was blessed with the name after literally wrestling God/an angel). So in the case of Judaism, where people sometimes argue with God, of course they are going to argue with eachother.
~Max