The separation of church and state is not always what it seems to be. Religion does not have to remain silent when it comes to politics. It can be a source of inspiration for politicians and it can enhance ethical consciousness and behavior. Therefore, it should not be excluded from politics. It is important to make the distinction between politics and the state. The separation of state and religion is a very important principle.
Freedom of religion requires it because without such a separation the choice of a religion will not be a free one (a state which is linked to a religion can force a religion on people or can force people to abandon a religion).
But this separation does not imply the separation of religion and politics. This distinction between politics and the state can make it easier to universalize the principle of the separation of church and state. Religious people obviously and justifiably fear the separation of religion and politics.