It has God for its author

Not one single book has ever been attributed to God.

and truth without any mixture for its matter. It is all pure.

Read Jeremiah and tell me that again (and make sure you aren't using a biased translation that inserts subtle words to completely change the meaning of something). All evidence shows that scribes have not transmitted the books faithfully (and even if they had, the authors themselves are also mere men, and the good news is not received from men, but from God).

And we know that older copies of the Bible have a lot of differences from later ones, meaning scribes and religious leaders changed it to their liking, just as it is written: "Look, truly for falsehood writes the false pen of the scribes." And if the book is inerrant, and declares itself to contain errors, then it must contain errors, because that too is an inerrant statement is it not? And therefore it is not inerrant.

The book is rife with contradictions. There is not Jew or Greek, slave or free, male and female. The same law is to be applied to the foreigner and the Jew...but also goyim are also too unclean to enter the temple and Jews cannot intermarry with them as not to corrupt their "holy race". Male and female he created them in the image of God...but also women are so unholy that they cannot even enter the temple, or even speak in public...all the while many female leaders are recorded. Eunuches are worthy of praise...but also too unclean to enter the temple. Thou shalt not kill...but also commit genocide. Do not repay evil with evil, and turn the other cheek...but also an eye for an eye and a tooth for a tooth, show no pity. Human scribes seize the opportunity to insert human rules to mislead people and control them.

Now does it make sense why Jesus complains about the scribes so much? And indeed, Judaism was still producing the Jewish Bible in his day.

Not only that, but there was no "Bible" until 150 AD, not in Judaism or Christianity, nor did God ever authorize one. And a Bible did not exist for the vast majority of Christians until the council of Rome, 3 and a half centuries after Jesus, and all the decisions were made based on what the church liked. And even that was revised all the way until the 1600s, when Protestants removed the apocryphal books.

And on top of all of that, our translations are heavily biased to skew the meaning even more in favor of the greedy church officials and popular preachers who want to control and steal from people. And woe to them for being popular, for this is how people treated the false prophets.

Watch out! Don't be misled by the traditions of men.