I believe Christ and John explain clearly what it means to be part of the Family of God through Christ.Anything beyond this I would consider a "cult"or pretty close.Matthew 20 :25-28 "You know that the rulers of the Gentiles lord it over them , and their high officials exercise authority over them.26. Not so with you.Instead, whoever wants to be first must be your slave.29. just as the Son of Man did not come to be served, but to serve, and to give his life as a ransom for many."NIV
John gives a nice example in 3 John 9-10 where one person assumes control over the Church as if it belongs to him instead of him being a servant of the congregation where all believers are equal in status under the control of Christ.There are no special qualifications which defines degrees in" faith".A person with a Masters in Divinity does not have more faith than i.e a carpenter who can barely read.It boils down to the human tendency to misuse power entrusted to one .
It happens today just as it happened in the early Church days as John explains although He does not call it a cult .I nevertheless believe it is implied regardless of the banner of a Christian Church."9. I wrote to the church , but Diotrephes who loves to be first , will have nothing to do with us.10. So if I come , I will call attention to what he is doing gossiping maliciously about us.Not satisfied with that , he refuses to welcome the brothers."NIV
That is the typical worldly corporate way. Christ does not work that way.