A very thoughtful post, respected brother!
The Qur'an, rather, favors the existence of intelligent life in the planets.
42:29 And among His signs is the creative design of the heavens and the earth, and the living creatures which He has dispersed throughout them. And He is Able to gather them together when He wills. [Here is an allusion to the existence of life in other celestial bodies, and to man meeting with the 'aliens' some day. 16:49]
16:49 Indeed, before God, bows in submission all that is in the heavens and all that is on earth, whether living beings or the angels, for none are arrogant. ['All that is' includes three classes of God’s creation: Inanimate things, living beings, and angels. Angels, here, represent God’s forces in nature]
Why intelligent life? Because Allah does not call humans the most favored ones out of His creation. It is we who erroneously think that we are 'the Crown of creation' (Ashraf-ul-Makhlooqat :-)
WA FADDHALNAHUM 'ALA KATHEERIM MIMMAN KHALAQNA TAFDHEELA in 17:70 (And We have favored them - humans - over many of those whom We have created.)
17:70 Surely, We have conferred dignity on children of Adam (as a birth right, regardless of where the child is born), and provided them with transport on land and sea and given them decent things of life. And We have favored them over many of those whom We have created.