To study other religions, the best books to use are the religions books themselves. Read and study them at your own pace and come up with your own conclusions.
There are several - different religions have different holy books.
There are no two books common to all religions. Actually there is no one book common to all religions. Though many religions do not totally dismiss the writings of other religions, they do not hold them at the core of their belief system.
No religion uses "Vendas". If you meant to write "Vedas", those are the holy books of Hinduism.
Teenagers typically use informal language that may include slang, abbreviations, and emojis when communicating with each other. This language can vary based on region and cultural influences, but it is generally characterized by a unique and constantly evolving vocabulary.
No, but do all religions have books?
Ummm... Similar to what, exactly? There are different versions of the Bible, in the sense that several Christian groups (and a few non-Christian groups, such as Judaism) differ in what books they consider to be "canon", that is, what books are included in the Bible. Other religions (non-Christians) have their own Holy Scripture, but those are different books, and they are not called "Bible". You would have to make up your own mind as to how "similar" you consider them to be.
Other religions that are not Christian do not call their holy books Bibles. They call them other names, such as, for instance, the Koran, in Islam.
There are no other books. However, you can find books of Apocrypha which are not part of the 66. Some religions use them and even include them in their Bible. In addition, you can find even more remote books which most do not consider Holy.
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Christian devotional books can be bought at most American bookstores. Different neighborhoods stores also provide devotional books for other religions, although which ones depend entirely on the local demographics.
The term Biblical Canon refers to the various books that are accepted as books of Holy Scripture. Different religions have their own lists of sacred books. Protestants and Jews agree on the same 39 books of the Old Testament but disagree on the order of placement. Roman Catholics and Orthodox add more books, the Catholics have two more books in their Old Testament Canon than the Orthodox. All Christians agree on the Canon of 27 books for the New Testament. Muslims have for their Canon: The first 5 books of Moses, Psalms, the four Gospels, and the Koran. Other religions have different Canons.