Alright, Looks like I'll reply and go LOL.
Well, I do believe that it is difficult, if not impossible to keep Politics and religion seperate. You can say that they are not exclusive of each other, but they're certainly an explosive combo. Political agendas eventually diffuse into religious orientations, beliefs etc, giving birth to religious politics which may or may not give a good result. When religious differences are expressed in politics, then they might prove to be, in some cases, beneficial for a particular group aswell. For eg - Mayawati's party openly prefers the dalits/backward classes, which has defenitely given rise to a little awareness.
In a nutshell, I think politics derives it's 'muddas' from religion and religious groups in turn look for some political support, infact sometimes religious groups are simply extentions of political parties. So in a way I think this combination is natural to some extent.
But the problem arises when the 'religious differences' are converted into 'political divisions' and two parties clash together on the basis of the religion they support. It gives rise to communal politics, which might have consequences, eg - Riots. Two religions are pitted against one another which obviously hurts the religious sentiments of people.
Now coming to the 'vote bank' point, well I think every party tries to mark it's vote bank in order to get maximum votes. For eg - UPA supports muslims, BJP supports hindus. Although it is wrong to manipulate people for the party's benefit, I think it has become quote a regular maneuver adopted by parties to safeguard their positions.
So lastly I think although the combo might lead to dangerous consequences ( which it defenitely has in the past ) - I don't think it is possible to keep the two aspects of the society segregated.