I personally do not think Jesus was interested in starting a religion, but rather in exposing the heart behind all religious expression. Religion easily becomes a substitute for a true heart, all clean and righteous on the outside and full of dead man's bones on the inside. I don't believe that some unified faith is possible as people typically define faith as a set of beliefs, that they should all think alike; and that that unity is seen as set of agreed upon beliefs. I however make distinctions between belief, faith, and experience in a religious/spiritual context. I put it like this:
Beliefs are like leaves on the tree that yellow and fall off at the end of the season and are reborn as new, different leaves at the beginning of the next. Faith is the reaching of the tree to the sun. Realization, or direct experience, is seeing and knowing and experiencing the tree itself; the sun, the sap, the ground, the leaves, the air and all that in within and surrounding and moving up through all things, creating and unfolding existence itself. And it is all known within you directly. And finally adaptation is to grow into that as a permanent realized state of your conscious life, your very lived being. That is the result of beliefs held with opened hands, faith realized into direct experience, and direct experience practiced and realized into a transformed reality.
It boils down to people defining themselves by their beliefs, which must then be defended and fought for, versus being defined by the content of their hearts, which can allow for different ways of understanding that faith in themselves. They are not married to 'correct thinking', as thoughts are illusory, whereas the heart is true.