Satan is not a human character, but a lot of the things he says and does make him resemble a Renaissance man, such as his emphasis on his own wisdom and his own achievements. Readers of Milton's time, however, would have considered Satan a chronic liar and a skillful deceiver. Should we sympathize with Satan's comments and behavior, or do you think Milton's treatment of Satan is a veiled criticism of the Renaissance emphasis on human wisdom and achievement? Or was Milton's attitude toward Renaissance humanism profoundly mixed and irreconcilably conflicted?
No, I do not think we should sympathize with Satan. Yes, a Renaissance Man cared about his own self-advancement, but he did not do so at the expense of others. All Satan cared about is himself, and doing what he wanted and getting what he wanted.