The LDS church teaches that the universe has no beginning... thus no original god creator

If this is so... how do we arrive at today? Without a starting point, time cannot begin to move forward and we would never come to exist. An eternal future is possible but an eternal past is not. There has to be an original creator. Also... are the LDS actually worshipping a created being who was once a regular man? Are other worlds without sin or do they have their own form of Jesus? Or did their man-god find another way to deal with sin and the cross isn't necessary as we would like to think?