I am absolutely against all religion, this 'dark matter'-'dark energy' malaki is becoming just that, all 'theory', by all account,the 'theory' has been adopted as 'FACT' & I call B$ until scientifically proven.
To say that the missing galactic 'mass' is of a ratio of 6-1,as stated, is pure speculation & wildly inaccurate.
My 'guess' is that the actual mass 'Baryonic' matter = 7-7 of the total, anything else is a 'mystery', 'miracle' or psuedo-scientific religion, based on ideological nonsense.
Like ALL 'religion',it's based on simple ignorance, wishful thinking, 'blind' faith & an absolutely fictitous guesswork.
When I see the 'evidence', appraised by peer review,I might consider that DE\DM exist, until then,I will retain my healthy scepticism.
Even so-called time served theoretical physicist are no better than 'religious' believers when it comes to having 'faith' in unsubstantiated speculative nonsense.