The difference between Christian stock investing and just regular investing is the companies that you will invest your money in.
It's not just about making money, but it's also about the ethics and the values that the company you are investing in support.
Really there is no difference between Christian investing and regular investing for a good investor; an ethical company is always going to be a much better choice than a none ethical company, it's just a basic principle of business.
Phil Towne said it well in rule 1 investing, think about this company as your family's sole source of income for the next 20 years. When you invest in a company you essentially support the ethics of that company. Take some time and do a little more research.
It's fine to make a lot of money, but don't turn a blind eye to the practices of a company in order to do this. Support fair trade, don't buy into companies that use child labor or sweat shops, it's all basic stuff really. Would you work for the company you want to buy in to? This will be your best indicator.