latest statistics i had a look at said 89% global, that was about 6 or 7 months ago. but really, these kinds of statistics are useless. it could be 70% or 98% in reality.
Also, these kinds of statistics do strange things at times. like assume certain people believe in a god when in reality they dont.
you just have to come to your own conclusion. the way i look at it is like this:
-everywhere i go online i see atheists and agnostics all over the place, be it spanish sites or english speaking.
-most churches i see sit empty week after week.
-certain organizations like catholics and mormons will never really let you leave. and even if you do there is a good chance they will still count you.
-most religions count babies and children as members, even if their parents are just forcing them to be there, and if they grow up to be atheists or agnostics they still count them
-some people belong to one religion for a while, then convert to another, with both religions counting them as a member, thus bulking up the figures all round.
-china has a lot of people, and most of china is atheist.
-there are religions like scientology and buddhism that are atheistic, and could very well be counted as believers by some stats
-the younger generation seems to be more secular, old people tend to be believers, and old people die every day.
personally, i think about 50% to 60% believe, with another 10% to 15% saying they do believe when asked, just because they think its the right thing to say, even if they only believe as much as they believe a broken mirror is 7 years bad luck.