Nontrinitarianism

==Inter-religious dialogue==
{{see also|Islamic view of the Trinity|Shituf}}
The Trinity doctrine is integral in inter-religious disagreements with the other two main [[Abrahamic religions]], Judaism and Islam; the former rejects Jesus' divine mission entirely, and the latter accepts Jesus as a human prophet and the Messiah but not as the son of God, although accepting virgin birth. The rejection of the Trinity doctrine has led to comparisons between nontrinitarian theology and Judaism and Islam.

In an 1897 article in the ''[[Jewish Quarterly Review]]'', Montefiore describes Unitarianism as a bridge between Judaism and mainstream Christianity, calling it both a "phase of Judaism" and a "phase of Christianity".<ref>{{cite journal |title=Unitarianism and Judaism in Their Relations to Each Other |first=C. G. |last=Montefiore |journal=The Jewish Quarterly Review |volume=9 |number=2 |orig-date= January 1897 |pages=240–253 |jstor=1450588 |date=2016-06-18 |doi=10.2307/1450588 |quote=You [Unitarian Christians] have relations and points of connexion with Judaism on the one side, and with orthodox Christianity on the other. You are in a position of vantage to absorb the permanent elements of truth and value lying at your right hand and at your left. For, looked at from one point of view, though you might yourselves deny it, you constitute a phase of Judaism; looked at from another, though many Christians deny it, you are a phase of Christianity. The paradox of the one assertion to some of yourselves is no greater than the paradox of the other to many beyond your pale}}</ref>

In Islam, the concept of a co-equal trinity is totally rejected, with Quranic verses calling the doctrine of the Trinity blasphemous.<ref>{{cite book|title=The Holy Qur'an|at=4:171}}</ref> Early Islam was originally seen as a variant of [[Arianism]], a heresy in [[Eastern Orthodox Church|Orthodox]] and Catholic Christianity, by the [[Byzantine Empire|Byzantine]] emperor in the 600s. In the 700s, many Arians in Spain considered Muhammad a prophet. In the mid-1500s, many [[Socinian]] unitarians were suspected of having Islamic leanings. Socinians praised Islam, though considering the Qur'an to contain errors, for its belief in the unity of God. Bilal Cleland claimed that "an anonymous writer" in ''A Letter of Resolution concerning the Doctrine of the Trinity and Incarnation'' (1693) states that Islam's greater number of adherents and military supremacy resulted from more closely maintaining correct doctrine than mainstream Christianity.<ref name=Islam>{{cite web|url=http://tellmeaboutislam.com/islam-and-unitarians.html|first=Bilal|last=Cleland|title=Islam and Unitarians|publisher=Tell me about Islam|access-date=16 June 2016}}</ref>