This depends on the country. Whilst in my country, there's really a certain impact for having a religion's back on a politician. It's because whenever there's an election, each vote counts. And whoever is the candidate that the religion will support, that's also the one that will be supported by its members. Although many of them are giving free will on who to cast their votes but certain religions do have block voting and that's why whoever gets that support of that certain religion, they're likely having a huge flock of voters gonna support to them whether they like or not its platform.