Have a look at the preceding and subsequent sentences in the article (the ones next to that quoted question), to see if your comment is relevant:

‘Christians have been explicitly instructed not to boast, since “all have sinned and fall short of the glory of God.” ’

“Why have Christians clung to that conviction even when their religion became an appendage of one godless empire after another, their myths and creeds being so many ways of styling the same old human tribalism, politics, and personal fears and prejudices?”

As I go on to say in the next paragraph, ‘From our late vantage point, Christianity isn’t God’s holy spirit upon the earth, but a religion and an institution like any other. The “gospel” is a myth or a powerful fiction like any other. Christians are people like all the rest of us. They claim they’re in the right and that they have the way, the truth, and the life, just as everyone else thinks they know what should be done.’

So all you’ve done is repeat your creed. Yes, you believe your creed because you’re a Christian. My point in the article is that that doesn’t make you special. Christianity isn’t special. The Christian institution failed to live up to its stated ideal many, many times, and the Christian creed combines Jewish and pagan ideas. None of it entails a supernatural source.