The Karaite-Zoroastrian theory suggests that Islam began as an alliance between the Karaites and Zoroastrians to fight against [[ Marcionism]].
According to the Karaite-Zoroastrian theory the Quranic Isa is Yeshu HaNotzri, not Jesus but the completely human son of his brother Joses Pantera and Miriam Magdalene who had a brother called Aaron.
Muhammad is the awaited seal of prophecy.
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Nasara are Ebionite followers of Yeshu HaNotzri.