We miss it when we look at this as just “supporting Islam.” You must look at the Sunni - Shiite split. These two groups hate each other, and what is happening is that Obama is supporting the Shiite Iranians here. The Sunnis (Saudis et al) are less than keen about this whole deal.
Recall that key Obama advisor Valerie Jarrett grew up in Iran, similar to how Obama grew up in Indonesia, and it all starts to make sense.
You are correct that he is supporting the Shia against the Sunni, but he supports all Muslims against Jews and Christians. He is bringing chaos to the world and many many will die because of his boiling hatred against the West and civilization.