Say, [O Muḥammad], "If there had been with Him [other] gods, as they say, then they [each] would have sought to the Owner of the Throne a way."1
Translation: Saheeh International (English)
1 To please Him, recognizing His superiority. Another interpretation is "...they would seek a way" to depose Him (subḥānahu wa taʿālā) and take over His Throne.
لَّٱبۡتَغَوۡاْsurely they (would) have soughtla-ib'taghaw
إِلَىٰtoilā
ذِي(the) Ownerdhī
ٱلۡعَرۡشِ(of) the Thronel-ʿarshi
سَبِيلٗاa waysabīlan
Tafsir
Say - O Messenger, to these idolaters: If there were other deities along with Allah as they say as a fabrication and lie, then those supposed deities would have sought a way to Allah, the Owner of the Throne, to try to defeat and combat with Him over His dominion.