Can major shirk be defined as attributing any of God’s attributes (such as the Healer and the Provider) to one of His creations, or by prioritizing and preferring something of this world over God’s commands?

The statement "Were it not for the doctor, my son would not have been cured," and attributing healing and sustenance to creation, is a subtle minor polytheism (shirk asghar khafi). Indeed, in the exegesis of the verse: (And among the people are those who take rivals besides Allah) [Quran 2:165], it is stated that "rivals" refers to polytheism more subtle than the creeping of an ant. As for prioritizing worldly interests over divine commands, this does not amount to polytheism, but it indicates weakness of faith.