Swerve and Ex Nihilo

Swerve is spontaneous, but not ex nihilo.  For, it presupposes a given condition with respect to which it is a variation.  In other words, what Swerve causes is a Modification, not a mere Effect, which is logically independent of pre-conditions.  Thus, Swerve cannot be the handiwork of an omnipotent deity, since it entails a constraint upon the power of the latter.  Hence, even if Swerve were deified, it could not be the ex nihilo creator of the Biblical tradition.