The famous atheist philosopher, Bertrand Russell, had the following to say in the opening of his book, Why I am Not a Christian. It is actually a good and challenging word His Church today.
“I think that you must have a certain amount of definite belief before you have the right to call yourself a Christian. The word does not have quite such a full-blooded meaning now as it had in the days of St. Augustine and St. Thomas Aquinas. In those days, if a man said that he was a Christian it was known what he meant. You accepted a whole collection of creeds which were set out with great precision, and every single syllable of those creeds you believed with the whole strength of your convictions. Nowadays it is not quite like that.”