In Self-Realization Fellowship, two of its gurus say that mermaids exist, at least in heaven. And since this is said in the guru Yogananda's Autobiography of a Yogi, and claimed to be from a freshly resurrected wisdom-avatar that is revered as Sri Yukteswar, I suppose few or none in SRF will gainsaiy it.
Then, according to Yogananda, his departed guru communicated one day:
"The
Forum:
"Cults," Sects, and "New Religious Movements"