[Ali Imran]

• James 2:10:
  This verse explicitly states, "For whoever keeps the whole law and yet stumbles at just one point is guilty of breaking all of it." 
  
  
  

When Adam stumbles, Allah forgives him when he repents. That is the Islamic paradigm.

In your paradigm, God is merciless. Not only does your God punish Adam when he stumbled, but he also punishes all of Adam's progeny for that small mistake Adam made.