The more substitutions you make to any recipe, the further you get away from the proper taste and texture it is supposed to have. You also remove that pretty pink color that the maraschino cherries give it. Like I said with the coconut above, when you remove the cherries, you are also removing some of the structure of the pie. WIth no-bake pies, there is no heat that sets the pie up so you are relying on filling ingredients to provide that. So yes, you can remove the cherries but you may not get the results you were expecting.