But it does involve us. Not only did a powerful spirit creature, Satan, get Adam to disobey, the book of Job (2:4) shows we are also challenged by Satan to disobey. We all the opportunity to prove Satan a liar.
Sometimes children do pay all of their lives for the crimes of their parents such as crack babies, or being born to drunken mothers, etc.
With or without religion, good people will do good things and bad people will do evil, but for good people to do evil----that takes religion.
As a parent you know your young child loves cookies, but you have told her cookies are bad for her and she must not eat cookies. So you leave the cookies unattended on the table, in plain sight, an then hide and watch to see if she disobeys, and when she does you severely punish her. Is this what a good parent would do?
Evil has been the one thing very difficult for the religious to square.
1.) "God cannot exist without evil" or "Evil is necessary as a counterpart to evil"
2.) "Evil is necessary as a means to good."
3.) "The universe is better with some evil in it than it could be if there were no evil."
4.) "Evil is due to human free will."
Each of these solutions implies a restriction o God's omnipotence. If god cannot create good without evil, that is a limit to his power. If God gives gives humans free will, then that is a restriction on his control of events.