An option you may
consider, which is an effective way I have found to do the altar call is
to first ask the kids who are already saved, and have accepted Jesus to
be their personal Savior to raise their hands. When the unsaved kids
see how many others have accepted Jesus, they are less afraid to do it
themselves. Have them put their hands down, then ask for the kids
who would now like to ask Jesus into their hearts to raise their hands
and to come forward.