Keith. You are not depriving a Christian child a place at school by lying about believing in all that nonsense to get your child a place for two reasons.

1. A state school cannot discriminate based on belief even though they break the law repeatedly by doing so. My taxes pay for equal opportunities.

2. There is no such thing as a Christian child.

The faith schools are oversubcribed.
If you lie and cheat to get a kid in, you are depriving an honest kid.

Also, you will have to explain to your kid why you lied and cheated.
The school will be telling the kid it is wrong.