Avoda Zara has real power?

Devarim (4:19) And lest you lift up your eyes to the skies, and when you see the sun, and the moon, and the stars, all the host of the skies, should you be driven to worship them, and serve them, which the Lord your God has allotted to all nations under the whole sky.

Rav Yakov (Emes LYakov 4:19) And lest you lift up your eyes to the skies, and when you see the sun, and the moon, and the stars, all the host of the skies….which the Lord your God has allotted to all nations under the whole sky. There are two different understandings found in the commentaries, The first says this verse is simply saying that the purpose of these heavenly bodies is to provide light to the entire world and the Torah is prohibiting worshipping them. However the Ibn Ezra and Ramban say it means that each nation has a unique star or mazel as does each city.  They provide genuine benefit and bounty.  It would seem that this is a fundamental disagreement as to the nature of idolatry.  The view of the Rambam is clearly that idols have no power at all and therefore prayer to idols not only violates the Torah prohibition but wastes his time and effort. In contrast the Ramban claims that G-d implanted in Nature that each nation would have a unique source of bounty from the higher worlds as long as it didn’t have relevance to Israel since Jews are not determine by mazel. However there is still a Torah prohibition to pray to this source of bounty since ultimately G-d is the source of all bounty and therefore prayer and devotion can only be directed to G-d not to His sevant. However if this source is worshipped and prayed to it can actually provide benefit. Thus the verse is saying that G-d gave each nation a unique source of bounty and guidance.