I know some who condemn "organized religion" because of historical incidences that have offended them. The Crusades, Jonestown, the Branch Davidians of Waco, and the events of 9/11 are some examples.
However, we have suffered negative experiences in families, corporations, and government, and we don't reject those concepts out of hand. Belonging to a religious community provides a lifetime of hope for many who suffer emotionally, spiritually or physically, and a lifetime of service opportunities for many who feel their lives are "on track."
The connection with a religious community is an exercise in humility — an admission that you don't know all there is to know about the divine, but that you are willing to learn from others and expand your spiritual awareness.
Just as small advances in mechanical understanding over the centuries have combined to make it possible to build vehicles that can carry hundreds of passengers to distant destinations, our individual spiritual experiences, combined with those with whom we associate, can enhance our spiritual growth.
Isolating ourselves from others who have like goals will lessen our opportunity for improvement. When one associates with an organized religion, one generally makes commitments of time, energy and finances to enhance the lives of those both inside and outside their community of believers.
According to sociologists of religion, Roger Finke and Rodney Stark, most Americans have a religious affiliation, and the churches growing most rapidly are those that provide both moral structures, contact with the numinous, and commitments to not only follow the tenets of that faith, but to reach out to touch the lives of others.