The bible describes them as righteous and God fearing. Job endured temptation many times more potent than just restraining from eating an apple. Would mankind still be in perfection if either one of them was the 1st man on earth?
True, but please bear in mind mankind was already fallen by the time they came into existence. They had already inherited the sinful nature from Adam's sin. But if they were in their perfection condition like Adam (before his downfall) could there be a chance of a victory over Satan? A thought just came to my mind...I guess they won't because if Satan being the 2nd most powerful creature could fall, so can they. You are right, there's no escape if men are left to their own free choice.