We don’t say that Judaism is wrong. Allah sent it as a religion. But then later Allah sent Jesus (a) and Mohammad (s) to complete the ultimate religion of Allah.
Some points about modern Judaism:
1- There are very little references to the Day of Judgment in the Old Testament. There isn’t really a mention of heaven and hell. Why is that? When it’s such an important fate, how come there aren’t verses in the Old Testament that talk about it?
2- The Old Testament describes many prophets in shameless ways: they committed adultery, they got drunk, they had no shame, etc… This is not acceptable
3- In Judaism, who is the successor of previous Prophets? Who is the final prophet? Who is the guide who guides people? God would leave people without a guide for thousands of years?
4- Judaism considers Jesus a liar and an impostor, and having an illegitimate birth. When we know he was one of the greatest prophets.
And many other points.