Actually, since he is a Muslim, ya kinda have to dig around for that fact.....
I dug around some; it's seems more likely to me that although he may have been attracted to Islam, he most likely acted alone and his horrendous act was not associated with any organized Islamic group. I fail to find any attendance at a Mosque on his part:
“...Roselane de Oliveira, a sister of the attacker, told Rio de Janeiro radio station Band News that the young man “was very strange.”
“He had no friends, and he spent all his time on the internet,” she said.
In recent months, she said, he appeared to have got closer to Islam.
Police stressed, however, that there was no concrete evidence that the attack had either a religious or a political motive.”
http://www.guelphmercury.com/news/w...-11-dead-in-massacre-at-rio-de-janeiro-school
Anyway, there's reports that he was severely bullied at this school growing up:
“Menezes de Oliveira’s classmates and former teachers said he was routinely bullied at school, rejected and taunted by girls in class, and forced to endure “constant humiliation” including being thrown into a school garbage can, according to Brazilian media.
Fellow students gave him the nasty nickname “Swing,” because he walked with a limp, said former classmate Bruno Linhares, who lamented to O Globo newspaper that “the class fool turned into a criminal.”
“They called him all kinds of names,” said Linhares, 23, who studied with Menezes at Rio’s Tasso da Silveira school where the bloodbath took place.
“I honestly do not know why he did not do that [massacre] with our own group,” Linhares told local media.
Experts took to Brazil’s airwaves, seeking to explain just how he could have turned to evil, with some saying Menezes could have been reacting to the abuse at school.
“Often the victim of bullying tends to isolate themselves, but can also become violent,” University of Rio psychologist Maria Luiza Bustamente said.”
http://taipeitimes.com/News/world/archives/2011/04/10/2003500402
If this is true then I'd say that had more to do with him going off the deep end than any affection towards Islam. Jmho. BUT, someone like this would be a prime candidate for brainwashing.....