1) Thou shalt always be honest and faithful to the provider of thy nookie.
2) Thou shalt try real hard not to kill anyone, unless of course they pray to a different invisible man than you.
Two is all you need; Moses could have carried them down the hill in his pocket.
I wouldn't mind those folks in Alabama posting them on the courthouse wall, as long as they provided one additional commandment:
Thou shalt keep thy religion to thyself.