Why do the religions of Krishna, Mahavira, Buddha, and Jesus decay despite Buddha's claim that the religion of the saints never grows decrepit?

According to Osho, what grows decrepit is not the saints’ religion but the hearsay, sects, and scriptures built by listeners who misunderstand from a lower consciousness. The saint speaks from sunlit peaks; we hear in dark valleys, turning living dharma into dogma. Languages and symbols differ, Truth is one; it is renewed whenever a Buddha, Krishna, or Christ appears and can only be understood by becoming meditative oneself.