No faith school does this. None whatsoever.
I, and thousands of non-Christian parents, know that you are wrong.

Giving children "a sound grounding in Christian faith and belief" has nothing to do with education
Yes it has, and in conjunction with a sound grounding in all the other major world religions it is an education that all kids should have to equip them to live in a multicultural country whose constitution and history are inextricably bound up in Judeo-Christian philosophy.

You are simply displaying prejudice.
We have the objective evidence of government inspections to prove that these schools provide a full and excellent education.
What evidence have you got to prop up your prejudice?