Well, to you're headline question.. Nope, Islam came after. And then Mormanism. Then 7th Day, and then Scientology..
I wish humanity was close to done, but, that doesn't seem to be the case..
Heck, if I ever get really desperate, I'll just become a prophet.. Easy money.. People will always buy it..
Of course, I can't see me being that desperate..
I don't think Islam, Christianity, Hinduism etc could be replaced with similar religions, not at all,, but they could be replaced with philosophy 'any kind of philosophy' because humanity now are moving forwards!
They began to reject these old religions and especially the Abrahamic ones..
Some people cant live without religion, so I have to say that religion could be replaced with what so called "spiritual philosophy" or "any kind of philosophy" but without believing in after life.