Radioactive decay is RANDOM, but not causeless. I looked into it a bit more, and unless I've been mislead, its caused by the 'strong' and 'weak' forces in a nucleus.

Bell's theorem, is a bit over my head at this point, so I can't refute what its implications are in depth for the time being. But as far as I know, it only involved things reacting to no cause whatsoever. I don't see the relevance.

Vacuum energy is matter appearing out of a vacuum (a vacuum that includes energy, space, and time). So it does nothing to explain how an infinite nothing could have caused time or space, or for that matter useable energy to be converted or to create matter.