As I said, I have some knowledge of the Jewish religion. I have, in fact, read the whole of the Hebrew Holy Scriptures. These scriptures are primarily history and rules, with some poetry. Our holy "book," Sri Guru Granth Sahib, our eternal Guru ji, is different. It is neither a history book nor a rule book. It is pure poetry, drawn from many different sources, Sikhs, Muslims and Hindus. It is our guide to finding our way back to Akaal Purakh (God).
Others may have other descriptions, at least as accurate.
The very first line is a sort of summary of the whole Sikh faith, called The Mool (Root) Mantar. I would suggest that you read that as an introduction to the Sikh view of the One Eternal. (One can spend a lifetime on this one sentence, and you don't need to get bogged down at first.)
So much more could be said, but I'll leave to others, and leave it to you to discover for yourself.
I must admit that I envy you a bit, at the beginning of this voyage of discovery. May you be blessed in this search and follow wherever it leads you. If it leads you to Sikhi, great! If it leads you to some other path, great! As long as it leads you somewhere.
Chardi kala!