Ishvalans

Natives of Ishbal are characterized by their brown skin and red eyes. They are a deeply religious people who worship the creator god and god of the earth Ishvara. One of their warrior priests who later became known as 'Scar' viewed alchemy as blasphemous to God because he felt that it turned a creation of God into a degenerative form. It has not been made clear in the manga whether other devout Ishbalans shared his personal beliefs, although a few Ishbalans, including Scar's brother, have been shown to have an interest in alchemy.

Massacre
The massacre of Ishvar in the manga was not used to create a Philosopher's Stone, but rather as one of required points of bloodshed to make a node of the Transmutation circle of Amestris. The Ishvar Massacre in Ishbal was started by the Homunculus Envy, posing as an Amestrian soldier, not Sloth.