We are indoctrinated from infancy to believe the only way to be spiritual - especially to be Christian - is to belong to a religion and adopt all of its beliefs. Truth isn't a building or a group. Truth doesn't change unless the reality changes or "get brighter" to match human understanding. Despite how many times a "generation" might change to a JW, when Jesus said it, he only meant one thing. Despite how many times Catholicism>Protestantism>modern Fundamentalism has changed understanding, the truth was always the same.
Humans' attempts at grasping at the mind of God are futile. Humans' attempts to force other humans to conform to it are evil. Religion can't bring you truth or salvation. It can only bring you human error and man-made rules. When the rubber hits the road, everybody is going to have to decide between his God and his group. No church has it right and no church can. The 1st-century church didn't have it right before or after Jesus died.
Nothing in the Bible indicates things are going to get any better for truth, either. All prophecies about religion are bad. But things started out bad; so they're just going to get worse. What group did you go to when your "brothers" were making a golden calf? Where did you go when your "brothers" were stoning Stephen? Where did you go when your "brothers" were setting up a pope? Where did you go when your "brothers" were burning Bibles and torturing people? Where did you go when your "brothers" were putting church dogma before Scripture? Where do you go when your "brothers" worship the Governing Body and the Watchtower literature?
Do you have to go anywhere? We are to be no part of the world, but do we have to become astronauts? We can mentally, emotionally, and spiritually separate ourselves from Satan's system, so what prevents us from doing the same with false worshipers around us? If they hate us because our faith in Christ doesn't allow us to follow "those who exchanged the truth of God for the lie and venerated and rendered sacred service to the creation rather than the One who created" (Rom 1:24), that was foretold. Jesus tells us to be happy because to suffer at the hands of false worshipers over pure worship is a noble thing.