Do you think that one day religion will become a thing of the past

[Clueless Morgan]

Basically, do you think that there will be a time when things like Christianity and Islam will be looked at like how we view Greek Gods now?

If history tells us anything it tells us that this will most probably be the case, yes.

Also....what do you think the world would be like if religion has never existed?

Different. The role of religion would, IMO, have been filled with some other ideology - maybe we would all be more political since we would be losing one of the methods by which humans controlled other humans and that hole would need to be filled with something. Our art would certainly look different, and the timeline of the development of some things would change.