In the hadith says that the reward of prayer in congregation is 27 times than praying alone. many Muslims count quantitatively as if by performing prayers in congregation then it will save as much as 27 times the reward. Similarly, when in the hadith says that prayers at the Grand Mosque reward will be multiplied a hundred thousand times. Incredible.

I personally understand this problem in terms of leadership and Islamic unity. Prayer in congregation means clustered with the guidance of a priest. What the priest will be followed by makmumnya, unless the priest was wrong.