If you look at religion, and there are many differing religions worldwide and no matter what your belief is, no matter what religion you follow.. What is it you are following? Is it the ancient written word, the gatherings, the worship or the fellowship of like minded people following the leadership of the priest, cleric, etc, etc. OR, is it the perceived object of your worship; GOD.
If there is only one God, then we are all worshiping the same God. Isn't the central core of all religion, love, peace,and the fellowship of man. If it is, then we fail miserably, we are so entrenched in our individual beliefs of teachings so old that maybe we should consider that in this modern age where our very existence is threatened, that we should engage in a collective goal to tear down the barriers that separate us as human beings. Forget the fire and brimstone teaching and get into the core value where we cherish each other and work for the collective good of humanity.
There are many who preach and act in the name of religion who forget the core values which are all the same, and continue fueling the separation that has existed for too long.
Who are you and what is God, the answer is simple if you look deeper.