Our oldest religions teach that God created the universe, and all life in it.  That He created us in His image.  They say that is why all life is so similar to ours.  Other people theorize that an older race seeded or engineered life through the galaxy.  And others say that life has simply evolved along similar paths due to circumstances we don’t understand.  And then some ask if those theories are as different as they appear.  Not many like that question.