As an atheist, do I want legislation reviewed by someone based on their belief of a mystical sky fairy? Probably not in an ideal world and certainly no more than having someone appointed on the basis of which side their ancestors fought on during the English civil war nearly 400 years ago (for example).
The problem with having an elected house of lords though is that, unless we are careful, we will end up with another house full of liars, thieves, mendicants, promise breakers, greasy pole climbers and time served arse kissers who pop up once every five years, promise you the earth and then promptly disappear into their Westminster bubble of lobbyists, whipped votes and free lunches.
If the answer to anything is ever "more politicians" then what the hell is the question???
What I would love to see, and something that will never happen, is for the Lords to be appointed by a lottery that every Brit is entered into. Make it a bit like jury service where you can get chosen irrespective of political persuasion, background, education, disability status, experience, race, gender or proclivity to believe in sky fairies. You serve a term of ten years or so and are then automatically replaced by someone else. At least it would be representative of society.