Why do people need religious beliefs and ideas?
I believe that you are correct in focusing on Cicero and, when you suggest that all religions are the same, I think that you are pointing to the way in which there are central importance teachings underlying most of them. Probably some of the teachings have been distorted in the implementation by organised religion, but the original teachers had a certain vision. It is likely that the distortions, as well as valid philosophy questions which turned people away, and it may be that are moving into a time of religio, as suggested by
@Anand-Haqq
I do believe that it is important for us to draw upon the best of all traditions of thought, religious and secular. Also, you point to the whole issue of male domination and it does seem that Western and some other religions have been served a patriarchal society. However, there is a whole tradition of the goddess. It may be that the idea of the goddess preceded the Judaeo-Christian image of God as Jahweh.This may be a lost, repressed aspect of religion. Certainly, some anthropologists, such as Chris Knight, have pointed to a matriarchy prior to a patriarchy.
I do believe that apart from asking why we need religious beliefs, the whole history of religion is also important. This includes understanding how the ideas were established. It also involves the complex relationship between mainstream teachings and esoteric ones. What I find is that the more I try to write, the more aware I become of the need to read so much more, because there is so much to discover.