Nothing wrong with that statement at all.  This country was founded upon Christian principles and as such, our laws were based on those principles.

As for which god?  Whichever God you choose to worship.  

Separation of Church and State simply means we govern as a secular state.  No religious teachings are to be mandated by government.

You're making a mountain out of a mole hill.  The rule of law still applies to you even if you are an atheist.  Consider yourself lucky, you're not living in a country where there is no separation of church and state.