Doubt so. Manichaeism is even more elitist than Christianity and had an utterly dualistic view of morality where everything evil was infected by Ahriman and had to either be transformed or destroyed, unlike the view of Christianity where Satan certainly controls mankind but everyone, even non-Christians, have the innate capacity to resist him and know God as Satan is not as all-powerful as Ahriman. Manichaeism is also arguably even more anti-Semitic since they probably held the Gnostic view that the Old Testament God is actually Ahriman himself. The idea that Gnosticism, and by extension Manichaeism, were almost a proto-Renaissance Protestantism simply has no validity, and all apologists of these religions should be ashamed of themselves for supporting religions that would have made Hadrian's anti-Jewish massacres look like a humanitarian mission by comparison.
Manichaeism was actually fairly different when it came to Gnosticism. He viewed the material world as containing both light and dark. Furthermore, he was born as part of the Elcesaites. That, alongside with the fact he mentions Jesus as inspiration alongside Zoroaster and Buddha, kinda makes me think that he probably did view the Old Testament God as that.
While it was inspried by Gnostic traditions, that doesn't make them the same and presumably, the Mesopotamian ones would be different than that of the west. The fact that Manichaeism did appeal to alot of people means that it clearly had a draw to it, enough to briefly challenge Christianity as the successor to paganism as the mainstream religion.