@sima74, where on earth has OP said she does not want her children exposed to knowledge of religion? On the contrary, she's happy for them to have RE lessons. WTAF indeed.
To withdraw them from these assemblies you need to write a formal letter to the headteacher that you wish to withdraw them from religious education. You cannot cherry pick
Not true, @AnnieLouJ67. As has been repeatedly pointed out, there is a major difference which the law fully accepts between acts of worship and lessons; it's perfectly possible and consistent to withdraw your child from acts of worship whilst being happy for them to be educated about religions generally. You don't have to believe in a religion to do RE, just as you don't have to subscribe to the views of Nazism to learn about its tenets.
@urkidding, what do easter egg hunts have to do with religion?
@Catsinthecupboard, you've written a great long post based on the premise that OP keeps her children away from knowledge of religion. Just making the effort to read her posts would have saved you the trouble, as your assumption is totally incorrect.
@Sunflower1989, again where do you get the notion that OP wants to keep her children away from the concept of religion?
Whatis it with the total inability of people to take the basic step of reading OP's posts on this thread?