It would depend on what religion we are talking about. There are religions that are by nature parallel with politics such as Islam - as it's a way of life.
With Christianity - it is subjective, as there are different kinds/sects. However, I remember liberation theology in South America where a group of priests actively moved for the advancement of the people's rights and progress.
I cannot condemn the people from religious groups who are joining the politics or giving positions on socio-political issues because after all, they are still citizens and they may also believe that it is not Godly to tolerate Evil by staying passive.
What they should not do is to compel their members to adhere to the same political stance.
A guide? Can be. Monopoly of Right? Definitely not.