Brief background: Religion and its relation with politics is a very broad issue for which we cannot come up with one single formula applicable on all the existing hundreds of religions especially around a dozen most famous ones these days.
In order to define the relation between religion and politics, it has to be discussed in particular cases for every religion as these religions do not share fundamental principals however some can be found very closer to other by sharing cross cutting messages but still there are a number of religions with hundreds of millions of followers at 21th century that can morally pass the same messages but in the meantime, they basically oppose the principles of believes. Therefore, there is a need to assess and evaluate the relations of every religion with the politics.
Secularism: Mostly, the political terms, secularism is recognized as a movement towards the separation of church and state particularly after the French Revolution and gradually named and discussed as a relation of Religion and Politics in a specific framework. In few words it happened when the high ranking bureaucratic authorities of the states were tired of compromising their power/authority with the existing parallel system of Catholic Church.
It’s believed that the general destruction of Catholicism had been far from the minds of the nation’s representatives in 1789, but financial concerns, when combined with external and internal threats, eventually made a full-scale attack on the Church and all connected with it a necessity for a Revolution that demanded absolute loyalty. The removal of Catholic institutions and their personnel simply forced religious worship into the private sphere and increased the involvement of the laity, trends that would also mark the religious revival that took place in France in the nineteenth century.
Islam and Politics: In Islam, the politics itself is the integral part of the religious principles that support, organize and control the individual, social relations with high values and in different levels from the couple, family, community, society, nationwide and finally to the international level.
Unlike Catholic Church, Islam does not have a separate parallel bureaucratic system and that is why the Masjid has never been considered a competent threat to the state authority despite the Masjids were being used by the oppositions of the states. In Islamic societies, the religious scholars often criticize the practices of the state authorities not their principles.
My perspective: I strongly believe the concept of secularism has frequently been misinterpreted despite the multiple interpretation of it. Notably, the justification of the secularism is very interesting and encouraging. Thus, the relation of the contemporary political values should be discussed with relevant values of a specific religion(political…) for contradictions or even possible antagonisms.