What motivates them?

Story.

BAGHDAD, Iraq (CNN) -- Three suicide bombings and a mortar attack killed at least five people in Iraq on Saturday. At least 62 others were wounded in a wave of insurgent attacks.

In the latest attack, a suicide bomb exploded on a bus in a Shiite section of Baghdad on Saturday afternoon. . .

Hours earlier, a bomber on a bicycle blew himself up inside a funeral tent at a Baghdad mosque, killing three people and wounding 38, Iraqi police said. . .

Shiite mosques were the targets of three suicide bombings and a rocket strike, officials said, while another bomber targeted Iraqi security forces at a checkpoint. . .

Iraqi national security adviser Mowaffaq al-Rubaie said the attacks were intended "to try to draw a rift, to dig a wedge between the Shia and Sunnis in this country."

He said the insurgents were "trying to portray themselves as defending Islam against the infidels and the foreigners."

"They are blowing up pilgrims; they are blowing up people who are attending the mosque to do their Friday prayers."

I can see how some Iraqi suicide bombers can be motivated based on some sense of nationalism to blow up Americans or Iraqi police "collaborators?" But how are the "insurgents" motivating people to blow themselves up as they are among innocent Muslims who are practicing their Islamic faith?