We know there is life because we are alive.  We have seen deaths, and it is clear we won't live forever.  But this is my view.  Buddhists might disagree.  While I don't think there is any kind of afterlife, most religions promise or suggest that there is something after you die.  Aside for attempting to sway people into being better human beings, perhaps this final carrot at the end is why religion has done so well in the history of humanity.  Even if reality turns out to be my viewpoint, at least many religious-inclined individuals gain the benefit of some psychological relief about the coming inevitability. Hindu and Buddhism teach origins quite different from Islam and Christianity, but these two have rather similar beginnings because they developed in adjacent locales.  For Christians, in the beginning God created the heavens and Earth. Only on the fifth day did He bring forth life, in the seas and also flying creatures . Land animals and us...