My best guesses:
Bahai -- For reasons stated above.
Islam, though probably in a couple of different forms:
As a personal religion -- something like Judaism is today. Even in Israel, they aren't keen on theocracy
As a mystic religion -- something like Sufiism
And as a religion with later revelations. There's one in Pakistan called Ammadhiyya that says the Mahdi has come and forbids holy war.
Buddhism and Taoism -- I don't see a lot of change here, because they're more tolerant and accepting of new ideas. The idea is to become a good person yourself, not to gain converts.
Judaism -- hey, after 10,000 some years of trying to kill it, it's still here. i can't think of anything short of human extiction that could kill it in the future.
Christianity -- Maybe. I think it won't exist in the literal sense. It can't survive as the current Armageddon is soon form, and most literal interpretations seem to contradict science. The one form I think could work is the charismatic personal experience form, perhaps with the idea that the kingdom of God is inside you, not something physical.
Tenrikyo -- It's a revealled religion based on Shinto. The idea is that through reincarnation and working for the good of all people, you remove dirt from your soul and get to be with Tsuhiki, who is God according to Tenrikyo.
And probably a bunch of new revelations. I could see combining several of the above into new religions.
Herbert mentions Buddislam, which seems like a distinct possibility. I could also see Christoislam, where Jesus dies to allow people to follow some rules. Tenrikyo/Islam also seems like a reasonable possibility. Maybe some forms of Gnosticism as well.
New revelations will increase after humans start living in space permanently.
What I'd predict is that religion will become more and more focused on the INTERAL part of man and less on EXTERNAL rituals and creeds.
Maybe there will be a rational form of Zen too. The idea being that the universe is logical and mathematical and that's what you should strive for.