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Just FYI they weren't testing Paul to see if he is an abomination. They are testing to see if he is a human (self control) or a animal.

His sister is an abomination as she has access to the genetic memories like a reverend mother but without a formed personality being a child. It's why the Baron is able to possess her.

But yeah Paul was a child playing god. Leto II was a god. Being a abomination did make it possible for him in a way Paul couldn't achieve.

You must remember that I have at my internal demand every expertise known to our history. This is the fund of energy I draw upon when I address the mentality of war. If you have not heard the moaning cries of the wounded and the dying, you do not know about war. I have heard those cries in such numbers that they haunt me. I have cried out myself in the aftermath of battle. I have suffered wounds in every epoch - wounds from fist and club and rock, from shell-studded limb and bronze sword, from the mace and the cannon, from arrows and lasguns and the silent smothering of atomic dust, from biological invasions which blacken the tongue and drown the lungs, from the swift gush of flame and the silent working of slow poisons... and more I will not recount! I have seen and felt them all. To those who dare ask why I behave as I do, I say: with my memories, I can do nothing else. I am not a coward and once I was human.

Leto II, The Stolen Journals