Tattoo is a permanent kind of image on the body. Therefore it is Forbidden (Haram) according to Islam.
So this means that the Cold blooded killer slaying Jewish children in France is NOT a Muslim
Tatoo is NOT the only thing. Tatoo is superficial. A Jihadi will go for Shadat ie Glory. A Jihadi will not run like a sissy. Yes a Jihadi may indulge in bombings ie using stealth but a Jihadi will not run away after shooting, a Jihadi will kill more and more till he is shot down by CT Ops teams.