Islam is similar to Calvinism, which led to Unitarianism.
Whoa! Islam is similar to Calvinism?
Let’s be honest, Calvinism did create quite a few schisms of its own, from Unitarian Universalism to denominations whose sole purpose has been the refutation of Calvinism. But Calvinists have not tried to hold all believers of a different religion as second class citizens, nor struck out against modern life in all its incarnations as much as possible.
Calvinism very much exists outside of Unitarianism. Be very careful with your assumptions. Unitarianism, in many Calvinists’ opinions, has no place within Calvinism.
What? Puh-lease.
Hoss