I have to be a bit heretical here, because unlike either most Christians or most atheists, and probably most other people on this board, i have to say that to some extent i do believe in Nostradamus's predictions. You have to bear in mind that they are constantly reinterpreted, but in about 1980, i went through them all and tried to work out if they meant anything. Among other things, i found that they appeared to predict the US destruction of oilrigs in the Persian Gulf in October 1987 and an attack by aircraft crashing into skyscrapers in New York City at some unspecified date within my lifetime. That was my interpretation at the time and not with hindsight. There is a story floating around the internet that that prediction was a hoax. Maybe there was a hoax quatrain, but there was also a real one from which i drew that conclusion.
So, my answer to you is yes, i do believe it because it predicted 9/11 successfully at least. They can be dated through the astrological information and are sometimes uncannily accurate, but the rate of fulfilment is rather low because there are roughly 1000 of them and they are supposed to take 5000 years to come true, which makes one every five years or so on average. Therefore there are probably about five or six which were fulfilled between 1980 and now, and i'm aware of two without looking at the notes i made at the time.