Basis of religion is morality, purity and faith, at least it is meant to be. On the other hand politics is for power. Religion is often used to give legitimacy to those in power to prosper and continuity. Religion was used to justify wars and conquests, persecutions, atrocities, rebellions, destruction of works of art and culture and almost all means of destruction.
When religion is used to substitute to political mileages, whole quality of the religion and its expected high moral standards get faded. if not contained, it will become a political force.
The thrust of the Buddha Dhamma is not directed to the creation of new political institutions and establishing political arrangements. Basically, it seeks to approach the problems of society by reforming the individuals constituting that society and by suggesting some general principles through which the society can be guided towards greater humanism, improved welfare of its members, and more equitable sharing of resources.
There is a limit to the extent to which a political system can safeguard the happiness and prosperity of its people. No political system, no matter how ideal it may appear to be, can bring about peace and happiness as long as the people in the system are dominated by greed, hatred and delusion. In addition, no matter what political system is adopted, there are certain universal factors which the members of that society will have to experience: the effects of good and bad kamma, the lack of real satisfaction or everlasting happiness in the world characterized by dukkha (unsatisfactoriness),anicca (impermanence), and anatta (egolessness). To the Buddhist, nowhere in Samsara is therereal freedom, not even in the heavens or the world of Brahama.
