If the god of the bible is real and the NT is to be believed, then God's true worshipers are scattered among weeds and will remain that way until the very end when the angels come to separate the weeds from the wheat at the great tribulation/armageddon.
There is no one true organization. There are only true individuals. Perhaps these true individuals, in obedience to the Bible's strong words against sectarianism, rightly refuse to align themselves with any of the named denominations in existence today.
I think true christians who really love God and Christ, would not be involved in the kind of petty sectarianism and promoting one denomination over all others the way sports fans back their favorite team at all cost. The true worshipers would not be promoting and drawing attention to a sect or an organization. They would be promoting and drawing attention to God and Christ.
Furthermore, I would say that those looking for a one true group to follow are looking for the easy way out. They are looking for the broad road of convenience and are avoiding the narrow difficult road of personal responsibility to study, understand and apply the bible on their own with the help of god's spirit. They also lack true faith in the power of God's spirit to lead them. They need visible men to lead them and tell them what to do. They are unable to worship without having an imposing visible organization to look to and depend on. Deep down, they are lazy idolaters who don't want to do the hard work of worshiping in spirit. They want to set their focus on things seen instead of focusing on the things unseen. These are the ones that get sucked in and misled by the weeds because they have not taken Jesus' illustration of the wheat and weeds to heart, but choose instead to believe the false, self-serving interpretations of this illustration that is given them by religious organizations intent on exploiting and manipulating them.
If there is no God, then the confusions, factual errors and logical fallacies so rampant in the Bible and all religions, make perfect sense.