I don't use that as a criterion when shopping, and have actually come to suspect "Christian" businesses. The worst shysters I have ever dealt with anywhere wore Christianity on their sleeve and used it as part of their marketing. It was clear they were trying to deceive me into thinking they were decent people when they clearly were not. When problems arose they were the hardest to deal with and problem resolution was always ugly. Others, such as Tyther Contracting, in the Minnesota metro area even advertises that they give "over 15% of company proceeds to non profit organizations". Well, that's fine, but my take on it is that they are probably inflating their prices to do it. The work this company does includes billing your insurance company, so it is fair to suspect that they are billing too much. Buyer beware when it comes to "Christian" businesses.
My recommendation is that you treat businesses in a business-like manner.