It's more than just deceiving to support jihad.
You're my brother, same family; we hate each other and never talk. Someone from another country wants to ask questions about you? I'll lie, 'cause you're family.
Those foreigners want to ask questions about our neighbor, who we've had a feud with for years? I'll lie, because the neighbor is part of the village; they're outsiders.
They want to ask questions about the people in the next village over? I'll lie, because those people are part of my tribe, and these guys are outsiders.
They want to ask about the people in the next district? Those people are part of my country, and these guys are outsiders.
They ask about those people in another country? If those people are muslim, I'll lie because they're part of my religious belief system, and these guys aren't.
Not EVERY muslim is like this; but those that are, see islamic teachings to support this.