What is the mainstream Shi'i belief about Abu Lulu? Was he a Muslim or Zoroastrian? And do we believe he was a good person and was his killing justified?
Abu Lulu was a Muslim, that is why he was praying in the Masjid Al-Nabawi in the first row like any other Muslim. If he was a Zoroastrian as some people claim,he would have been forbidden from entering the Masjid like any non Muslim. I don't want to enter here in details of the reasons of what he did.
Wassalam.