By rule,
“The snap begins when the snapper first moves the ball legally other than in adjustment. In a snap, the movement must be a quick and continuous backward motion of the ball during which the ball immediately leaves the hand(s) of the snapper and touches a back or the ground before it touches an A lineman. . . . The snap ends when the ball touches the ground or any player.”
If the snap does not conform to these requirements, it is an illegal snap, or snap infraction, and the ball remains dead. Just like a false start foul. Otherwise, the ball remains alive and there is no foul.