No religious beliefs
So because Baha'u'llah wrote that religions come from the same God, that means that He was trying to deceive and trick people? What would be His motive? It seems to me that if He was trying to deceive and trick people He would have said that the Baha'i Faith is the only true religion and all the other religions are false, which is what Jews and Christians believe about their religions. Baha'is do not believe they have the only true religion.
Here's something that seems totally reasonable to me. I don't know how close it is Baha'i beliefs.
Let's take as a premise that there exists "something" beyond what we we currently know of the material universe, that has some power and some knowledge. Let's also say that it has some kind of "emanation" that cause people to have some kind of feeling that it exists (I'm trying to be as vague as I can). It seems reasonable to me that this would generate a multitude of different religious beliefs, as people tried to systematize these feelings.
In that case we could correctly say that all religions were triggered by the same entity, but none of them have a correct description of this entity because there simply isn't enough data available to support these beliefs.
(I'm not suggesting this is true. But the idea that is some common factor from which all religions spring is attractive to me.)