I do. In the past- up to the age of 18 I wasn't really sure of religion. I saw it as a form of control and I hardly felt compelled to follow a religion my parents barely practised.
But employing what I believe is logic, and continually critically assessing my faith and the world around me, I strongly believe there is a God.
I understand the majority of people's sentiments here if they don't believe but the sense of arrogance emanating from some and their atheist views especially considering the fact that they haven't even made the effort to seek knowledge (a compulsory duty on every muslim called 'Hidayat') or critically analyse faith undermines the cogency of their belief.
Not preaching here but in Islam, there's a great deal of logic employed.. The basic message always being, think think and think again. Also, one of the verses that I like to quote: