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And they said, Is not this Jesus, the son of Joseph, whose father and mother we know? how is it then that he saith, I came down from heaven?
Note 7 at Joh 6:42: These Jews assumed that Jesus was the son of Joseph. Jesus never said that. It was their own supposition. If their supposition is accepted as true, then their conclusion would also be true. Their reasoning wasn't flawed, but the "facts" on which their reasoning was based were wrong.
Likewise today, we have accepted many religious prejudices as being true that are not, and that leads us to wrong interpretations of God's Word. We have to make a conscious effort to make sure that the foundations of our faith are anchored firmly in God's Word and not on the traditions of man (Mt 7:24-27).