It is difficult to make definitive statements about hypothetical scenarios because history and the development of religions are influenced by complex and interconnected factors. The emergence and evolution of religious beliefs and traditions are shaped by a multitude of historical, cultural, and sociopolitical circumstances.
Zoroastrianism is considered one of the world's oldest known monotheistic religions, and it has had an influence on various religious and philosophical ideas in the ancient world. Some scholars believe that certain elements found in Zoroastrianism, such as the concepts of dualism, judgment after death, and the idea of a cosmic struggle between good and evil, may have influenced the development of later monotheistic religions, including Judaism, Christianity, and Islam.
However, it is essential to recognize that the Abrahamic religions (Judaism, Christianity, and Islam) have their distinct historical contexts and religious developments. Judaism, for instance, predates Zoroastrianism and has its roots in ancient Israelite beliefs and practices. Christianity emerged from within the Jewish context, while Islam arose in the Arabian Peninsula several centuries after the founding of Christianity.
While there may have been cross-cultural exchanges and influences among ancient religious traditions, the specific development of the Abrahamic religions was influenced by a wide array of historical, cultural, and social factors unique to each tradition.
Therefore, it is speculative to assert that the Abrahamic religions would not exist if Zoroastrianism did not exist. The history of religions is multifaceted, and the development of each religious tradition is shaped by a complex interplay of various factors over time.