Is the Jedi way Jediism or a Jedi religion? That depends entirely on your relationship to, view of or interpretation of the Living Force. If as a Jedi you believe, worship or behave in a way which prescribes to the existence of the Living Force as being an omnipresent, omniconscient or omnipotent Deity or indeed a supernatural power then your relationship to the Living Force is religious in nature. If that belief becomes systematic by taking on a form of worship and conduct (expressed in a doctrine, through liturgy and with a community) then that relationship becomes a religion.
"Do. Or do not. There is no try!" - Yoda