No, it is not. Many religions predate Judaism. In fact, we can trace the origins of Judaism back to ancient Mesopotamia. Some scholars think the Australian Aboriginal religion to be tens of thousands of years old, making it the oldest, still practiced religion on the planet.
The sumerians had one of the earliest civilizations, following Enlil. Presumably before that was the flood, if you believe in the accounts from genesis and other early mesopotamian writings. Everything from the pre-flood world would be nonexistent and untraceable.
1. The oldest religion of all, was likely an animistic/Shamanistic one, or something like Sun worship. Basically, a nature/mother religion, as some call them.
2. The Sumerians had their own religion, and they predate the Hebrews.
3. The oldest organized religion active today is likely Hinduism.
4. The oldest monotheistic religion still active is Zoroastrianism.
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Of course not. Primitive tribes always had gods of some sort.... spirits or ghosts or whatever to explain what they did not understand. We know that Neanderthal's buried their dead with ceremony...flowers on the body were found at many Neanderthal grave sites. As soon as man of any ilk evolved with enough smarts to understand that there were things he could not explain, religion was invented.
And you can be sure on of the stronger males in the tribe would step forward to be the shaman to interpret "signs"..........where ever or whatever those signs might have been.
Religion has been with humanity since the dawn of his intelligence.
If a crop failed, the god(s) were displeased. If a flood came, same answer. If the forest caught on fire by lightening, gods were responsible. And sacrifices were made.... either in the form of food, or children, or whatever the tribe valued. If THEY valued it, the god(s) would too.
I should imagine religion has been around ever since consciousness evolved. For as long as there has been fear of death, of the hostility of nature, the dark and the unknown. As long as there has been guilt and shame. And belief that ritual or appeasement can confer power over these terrible and uncontrollable things.
Judaism is quite ancient. But I am sure there are other formalised religions, with written records, that are older.