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“He designates his authority to men?”

Yes, he does. Every person is required by God to submit to others. Even Christ Himself demonstrated willing submission to His Heavenly Father as well as His earthly parents, though He Himself is God. If Christ demonstrated submission, how much more does God expect disciples of Christ to submit to authority?

We live in a day of buffet-style Christianity—a day when “every man does that which is right in his own eyes.” But this is not how God ordained things. And rebellion against God-ordained authority is very dangerous.

Ephesians 5:21
Submitting to one another in the fear of God.

Hebrews 13:17
Obey those who rule over you, and be submissive, for they watch out for your souls, as those who must give account. Let them do so with joy and not with grief, for that would be unprofitable for you.

1 Thessalonians 5:12-13
And we urge you, brethren, to recognize those who labor among you, and are over you in the Lord.

Jude 11
Woe to them! For they have gone in the way of Cain, have run greedily in the error of Balaam for profit, and perished in the rebellion of Korah.

To learn what Jude is referring to about Korah, see this passage in Numbers:

Numbers 16:3, 23, 24, 31-33
[The sons of Korah] gathered together against Moses and Aaron, and said to them, “You take too much upon yourselves, for all the congregation is holy, every one of them, and the Lord is among them. Why then do you exalt yourselves above the assembly of the Lord?”... So the Lord spoke to Moses, saying, “Speak to the congregation, saying, ‘Get away from the tents of Korah, Dathan, and Abiram.’”... Now it came to pass, as he finished speaking all these words, that the ground split apart under them, and the earth opened its mouth and swallowed them up, with their households and all the men with Korah, with all their goods. So they and all those with them went down alive into the pit; the earth closed over them, and they perished from among the assembly.