All hypotheses and theories have mysterious and unexplainable complex factors relative to them, including the Big Bang Singularity (or whatever you want to call it) and the TOE. This is no exception.
There is a key difference. Religious claims seem to assert that some things are inherently unknowable and untestable and that the questions are therefore unanswerable. Scientific theories instead have elements that are as yet unknown or for which there is currently insufficiant evidence available from which to draw reliable conclusions. These are areas for research and investigation.
The eternal nature of a creator Vs the as yet unknown aspects of BB theory are a case in point.
An inherently untestable hypothesis is not really a 'hypothesis' at all so the two are not equally valid.