I suffer from this delusion.
I tend to believe in a "magic fairy in the sky" as Foolestroupe likes to call the deity.
I say "tend" because my faith is shaky.
I have doubts.
Most people of faith, apart from the fanatics, also have doubts.

I am amazed at the arrogant certainty expressed by many here.
Remember that many, most even, of the greatest intellectual giants our species has produced have had some form of faith.
That is true still today and includes great scientists and cosmologists.
That does not make us right, but it should make you ponder.
What great insight do you have that a lifetime's consideration failed to give them?