The deras follow the path of Bhakti and cater to the religious needs of the Sikh and Hindu Dalits. Sikh orthodoxy considers Deras run by Sikhs as apostates. There have been attempts to kill some of the Dera chiefs by Sikh fanatics. Muslims are not part of the Deras. There is a great deal of casteism in the Punjab.Christian missionaries have converted about 1 million Sikhs in the last 30 years. Since the Sikh Dalit population and to some extent the Hindu Dalit population do not get respect in society they are either veering towards conversion to Christianity or they are joining the Deras where they are treated with respect. At least that is the opinion of some people.
Are they part of Hinduism?
They claim to be the confluence of all religions. So the answer to the above question is both yes or no. A Hindu follower can take it as part of Hinduism while a Sikh follower can think it as a Sikh organization. https://www.derasachasauda.org/