True, but just because their additional book simulateously tells them that the prior scriptures are true and that Jews should look to their scriptures and Christians to theirs. But then it goes on to contracdict some of the most important parts of those scriptures and calls them corrupt.
So just because their additional book tells them to accept the prior scriptures, doesn't mean they do. And doesn't mean they ever spend time studying them.
That has been experience also when talking to Mormons, Jehovah's Witnesses, Christian Scientist, etc.
When the Scriptures disagree with their theology, they pull out the "Scriptures are corrupt in that particular verse" game.
Even most Protestants play a similar game by rejecting some of the 73 books of the Bible accepted by Catholic and Orthodox Christians.
Singling out the Muslims for playing the cafeteria game with the Bible is not very convincing.
The Catholic Church, therefore, recognizes that Protestants, Jews, and Muslims worship the same God as Catholic and Orthodox Christians.
I agree with the Catholic Church Catechism.