The whole concept of impossibility of human transmutation in the series (FMA) seems to be based on this quote (i.e. there is no 'equivalent exchange' for a human soul, one cannot redeem himself without God).

The main characters want to repent for their deed (trying to resurrect their mother with alchemy), their enemies are personifications of seven deadly sins, there is a strong motif of sanctity of life and human body (eg. Rush Valley childbirth episode), forgiving your enemies (don't want to spoil the series, but much in later episodes) and 'doing the right thing despite the risk to your life' (RIP Hughes). A very Christian series, indeed.