It is a fallacy, just not a formal fallacy. It is within the purview of informal fallacies. An informal fallacy is found in the content of the argument itself, not its logical structure. The "no true Scotsman" fallacy occurs when the standards for a category are arbitrary, irrelevant, or are established in an ad hoc manner purely to win the argument.

You can be a part of a group with strict tenets, and be a hypocrite that follows none of it too. After all, you cannot be a hypocrite of something without having placed yourself within the group or set of tenets of which you are hypocritically not following. Thus you can be a Christian, and a hypocrite. You can say that, you are either a hypocrite or a Christian, and that's all well and good too, but perhaps that's a different argument. In language, you can specify the group or set of tenets one is a hypocrite of. Thus these are Christian hypocrites. Just as there are probably a few Muslim Hypocrites too.