Not really. What do you then do about the bullying that the minority of students who do NOT join in will have to endure from the majority, and possibly from the teachers themselves? When you have a public school which is 80% or more Christian, any Jewish, Muslim or atheist students who do NOT participate, basically paint large targets upon themselves when they opt out.
And what about those schools which may be majority Christian, but have a Jewish teacher leading the class. Will he be able to lead the class in Jewish prayer? What about Muslims? No, the experience here in the US is that prayer in public schools, rather than being a uniting factor, actually divides those schools. It's a bad verdict, as I'm sure you'll eventually find out.