The first way is to be completely ignorant.To ignore the fact that the bible is a hopelessly flawed man made document, and all other reasoned argument and evidence that points to the non existence of the Christian God. This strategy basically involves living inside mental cocoon and closing your eyes to any alternative views. The best way to employ this tactic is to perform a whole lot repetitive and ritualistic action; a whole lot of head bowing and praying etc... etc....you know the drill!
The second way of being a true Christian is to become completely and utterly intellectually dishonest. You see this in Christians who have become aware of science, philosophy and archaeology come up with the most absurd and convoluted arguments to try and defend the authenticity of the bible and their God. Their thinking basically is the equivalent of trying to put a square peg into round hole...but they keep trying.
I suppose a Christian can employ a combination of the two tactics. But basically there are only 2 ways of being a Christian: be ignorant and/or dishonest.
merry Christmas!!!!!!