I absolutely do not believe that such complex organisms simply sprung up after the primordial soup was struck by lightning or radioactivity.
Science is capable of as much nonsense as religion, and the pressure to accept accidental life is no less irritating to be told that the Earth was made in seven of our days.
Seven of God's days? Fine. After all, one of God's days could have lasted for a trillion years.
And who or what is God? We are not supposed to know that yet. We have enough to deal with by trying to live bringing the next generation to self sufficient adulthood.
Ironically, both science and religion have proved more capable of killing humans than of finding the ultimate answer: how did we get here?