The Catholic Church does not consider Baptism valid or invalid based on whether those doing the Baptism are in a "cult" or not.
The criteria have to do with the formula of the words, the action of pouring water, and the intention of the one baptizing.
Any person--Catholic, Protestant, Hindu, Buddhist, Mormon, atheist, etc.--can validly baptize another person. What matters is the words, the action, and the intention.
The criteria [for baptism] have to do with the formula of the words, the action of pouring water, and the intention of the one baptizing.
There was no action of "pouring of water" in the example Jesus gave us when John The Baptist baptized him.
Physical body baptism is submersion. (As differentiating between that and the Baptism of The Holy Spirit)