Everyone's entitled to their opinion, though I can't imagine why one's belief or lack thereof in a particular deity should have any bearing on their trustworthiness. It seems to me that saying Product X is good/bad/indifferent is a statement that pretty much stands on its own merits and shouldn't really have anything to do with one's beliefs or opinions about anything else. Or, put another way, why should one's personal beliefs colour the trustworthiness of their opinion on a completely unrelated subject? It's like not trusting someone's opinion on food establishments because they live in Boston, or they have a pet terrier, or they have a particular fondness for Larry Niven's books.