We don't know if stem cells really work, but from the research that i've seen. There is a significant amount of positives to negatives from what stem cells do. In my opinion, stem cells do everything. Just the 'church' is stopping us from developing it more.
You know some people at a college in California(or Colorado, I forget which) found out a way to basically 'rogram' bacteria to do certain things. Perhaps they could make an HIV killing bacteria or something.
You know that one can get Stem cell in other places other than a fetus. It's not that us "Christians" are saying no to the research, just the means of garnering the subjects to work on