Mandaenism and Christianity

This paper [*The Priority of Mandaean Tropes Generally Considered Derivative of Christian and Islamic Influences*](https://www.academia.edu/32005295/The_Priority_of_Mandaean_Tropes_Generally_Considered_Derivative_of_Christian_and_Islamic_Influences) seems to show that [Mandaenism](https://en.wikipedia.org/wiki/Mandaeism) influenced a lot of Christianity and Islam, as we see many parallels between the texts, instead of the reverse claim (which the paper calls "standard model") that Islam and Christianity influenced the *Ginza Rabba* text. **How would Christianity evaluate whether this claim is correct?**