That's a very problematic argument for a few reasons. Firstly your now considering early Judaism unenlightened. However the core beliefs are still very much th

That's a very problematic argument for a few reasons. Firstly your now considering early Judaism unenlightened. However the core beliefs are still very much the same; and many customs from contemporary Norse times are still observed by some sects. Secondly that's the practice of religion; which is very different from a belief itself. It is possible to believe in God or a set of gods without following the practices of the organisations themselves. The difference between then and now is that a) you were "sold" the practices as an inherent part of belief in XYZ God and b) to believe without practising them was dangerous. As a result the actual belief in the Abrahamic God is somewhat irrelevant to the practices.