The word kufu' as used in the original means an example, a similar thing, the one equal in rank and position. In the matter of marriage, kufu' means that the boy and the girl should match each other socially.
The verse means that there is no one in the entire universe, nor ever was, nor ever can be, who is similar to Allah, or equal in rank with Him, or resembling Him in His attributes, works and powers in any degree whatever.
(2:208) O Believers, enter completely into Islamand do not follow in the footsteps of Satan, for he is your avowed enemy. God demands that man should submit, without reservation, the whole of his being to His will. Man's outlook, intellectual pursuits, behaviour, interaction with other people and modes of endeavour should all be completely subordinate to Islam. God does not accept the splitting up of human life into separate compartments, some governed by the teachings of Islam and others exempt. (Tafheemul Quran)