Outward formalities were kept intact...
Outward formalities were kept intact, but the spirit of piety, truthfulness, justice, sincerity, love, equality and patronage of science and knowledge did not exist, especially during the Umayyad period when true knowledge was despised and discouraged. The only thing which was encouraged was poetry, pre-Islamic customs and boasting of one's ancestry. The result was that politics was separated from religiousness.
In other words those who represented spiritual heritage of Islam were not allowed to take part in political affairs and those who held political power were alien to the spirit of Islam, and carried out only its outward formalities such as congregational prayers and the appointment of the officials to perform Islamic duties. They were caliphs and the commanders of the faithful only in name. At last even this duality disappeared and the outward formalities were also gone.
Even the form of government officially became pre-Islamic. Spirituality and religiousness were totally separated from politics. From here it can be understood that the biggest blow which was dealt to Islam began from the day that religion and politics were separated from each other. Though during the days of Abu Bakr and Umar religion and politics still to a certain extent went together, the seeds of their separation were sown during that period.
The things so developed that Umar made repeated mistakes and Imam Ali corrected them. Fortunately Imam Ali was his regular adviser. The separation of religion and politics being the greatest threat, the well-wishers of Islam wanted to keep them together. The relation between these two is that of spirit and body. The body and spirit and the husk and kernel should remain united. The husk is required to protect the kernel from which it draws its strength.
Islam gives importance to politics, government, political laws and jihad only for the purpose of protecting and preserving its spiritual heritage that is monotheism, supremacy of spiritual and moral values, social justice, equality and regard for human sentiments. If this husk is separated from its kernel, the latter will be damaged and the former will become of no use. The bold action which the Imams took was the protection of the spiritual heritage of Islam.
They separated from Islam the institution of caliphate as it existed. The first Imam who took this action was Imam Husayn (AS).