I can only image that religion will be reduced in prevalence in industrialized countries and the world as the developing world continues to develop but will always be present in some form. The wonderful thing about unfalsifiable nonsense is there is no limit to it. There will be new strains of "isms" and "anitys" as long as there are people to come up with them as it was people who came up with them all in the first place.
Irrational woo thinking will always predispose people to believe all kinds of absolute nonsense. The internet is a good antidote to this at least in the developed world. However, I do believe anthropomorphic monotheism will eventually die out.
I think Asimov had a great answer to this, when he wrote "The Last Question". Here is the plot summary, which even though it is only a summary, captures the story wonderfully...
Well if growth is any indicator Islam will overtake Chrisitianity in the next century. the Bahai faith looks like the only new Abrahamic religion that has a chance, although very small. trends do look similiar for that religion for widespread adoption asimilar to it's predecessors. Although some of the tenents of that religion will inhibit fast growth. the numbers are still relativley low. 1.7% growth or about 130k new Bahai's every year. this does not look to out pace "non religious" affiliated people. the "non religious" does seem to be the fastest growing population in europe for many years now and seems to out paces even islam. So right now i would bet on islam with a dark hourse being the bahai's.
Made me think of this:
Don't fool yourslf. There will always be people who need the crutch of magical thinking.
Religion will always exist in one form or another.
Even Christianity has evolved over the 2000 years it has been around.
The church may go away, but the belief in the supernatural will stick around for a long, long time.
I agree, why stop now? Over 3700 supernatural beings, of which 2870 are considered deities. They are grouped in the following subcategories:
NATIVE AMERICAN GODS
SLAVIC and BALTIC GODS
SOUTH AMERICAN GODS
SOUTH-EAST ASIAN GODS
And the Abrahamic gods, which includes the Jewish, Christian and Muslim god.
Sadly, I think humankind will go on creating deities for as long as it can. However, eventually, I believe, if our species is even alive at the time, one day this planet will no longer be inhabitable for one or more reasons. Unless we can find a way to survive long-term in some extra-planetary way, all gods will be dead.
It is amazing to me how theists cannot or do not see that humanity, life on Earth, and indeed the Earth itself, is fragile and transitory in the big scheme of things. Where will their gods be when all life on Earth is wiped out? Nowhere, just like they were before life arose here and developed enough to dream up deities in the first place.
All of the various religions will be "mythology" then, having come and gone in a micro-instant of geological time. Makes you all warm and fuzzy, huh?