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The obvious answer is that they cannot. The implication is equally clear: if even these two kinds of man cannot be deemed equal, how could any created being, with its intrinsic, utter dependence on other created beings, or any force of nature conceivable or imaginable by man, be thought of as possessing powers comparable with those of God, who is almighty, limitless, unconceivable - the self-sufficient fount of all that exists? (This argument is continued and further elaborated in the subsequent parable.)
The first parable is of two men, one of whom is a slave completely under the dominion of another, with no powers of any sort, and another a free man, who is gifted in every way, and is most generous in bestowing out of his opulent wealth (material as well as intangible), privately and publicly, without let or hindrance; for he is his own master and owes no account to any one. The first is like the imaginary gods which men set up,-whether powers of nature, which have no independent existence but are manifestations of Allah, or deified heroes or men, who can do nothing of their own authority but are subject to the Will and Power of Allah; the second describes in a faint way the position of Allah, the Self-Subsistent, to Whom belongs the dominion of all that is in heaven and earth, and Who bestows freely of His gifts on all His creatures.