It is an opportunity to realize and become conscious of a Higher Power. The Truth IS, nobody can say it. You've got to live it. Just like one's physical fitness is determined by the strength of the body, one's spiritual fitness is determined the feeling of oneness, the desire to be with the divine and the strength of one's will power. In reality, religion and spirituality are the same.
Spirituality is at the core of all religions.
However, some religions have forgotten this core and fiction seems to have replaced fact. Religion has come to mean 'blind organized faith' and has become dogmatic and fundamentalistic in its views. It is based more on personal experiences rather than the experiences of others. Since the Divine is universal, there is no religion in yoga. It could be said that Jesus and Buddha taught Bhakti yoga and Jnana Yoga respectively.