What will be the consequences for medicine, biology, philosophy and religion if life is found outside the Earth?

I was brought up in a very strong Christian environment. Unlike my brothers and sisters I was never able to embrace Christianity so I began looking for alternative explanations for our genesis and why the world is how it is. I looked to science and evolution, eastern philosophy, and my own observations of human interaction and from this wealth of human knowledge was able to discern one incontrovertible truth which remains constant in all science, philosophy and religion. Can you tell me what it is?