حجة إقناعية
Persuasive reasoning that brings an audience to conviction through familiar or accepted premises.
A technical question concerning the verse is how necessarily the hypothesized plurality of gods would lead to corruption. In a conclusive demonstration, the conclusion follows necessarily from its premises. Persuasive reasoning appeals to accepted signs, habits, or patterns whose force may need further articulation.
The authority of the verse within Islamic theology is a separate matter. The issue here is not whether the scripture is true, but whether a particular formal reconstruction of the argument is decisive on its own or depends upon additional premises.