Yes, this recipe can be made without alcohol!  There is such a small amount of Amaretto in this recipe that you can simply omit it without compromising the texture of the cream. So if you do not wish to include alcohol in your Tiramisu, simply don't add it to the eggs. If you want to bring in the hint of almond flavor, add about 1/4-1/2 tsp of almond extract (no more or it will overpower).