It will never be completely gone. Too bad really.
It will continue to trap the weaker minded and those who cannot think clearly. There will always be a segment of the population that cannot deal with reality and need to keep the religion crutch close-by. Who knows, it may actually grow at various times. Mankind has a lot of superstition to overcome before it will even decline much I fear.
Opposition to it will only fuel the fire. Nations who have attempted to wipe religion out have always failed. Technology will continue to take little chunks of religion, but never a large bite. At least not for a very long time.
I am afraid that the beast is stronger than it appears.
Jeff