The horrifying BIG BANG!?

Acording to the bigbang the universe evolved from a small point which erupted and created the space time contininum at the time of eruption I suppose the point was rotating rapidly because we are all rotating about somethig and this blast nade the matter split up Now imagine this i have made a small ball with a han full of mud and i place it on the ground and rotate it in hthe process of rotation the mud will be splited up from the ball unformly and at last after the ball is all gone i see a disc of mud so my question is why are galaxies in different shapes but not only disc shaped and spiral. I will also be pleased if you would answer for this Why does a body tend to rotate.