1. Lee's theology and biblical interpretations are very thin. They basically consist of two repeated themes only which are shoehorned into every message and Bible study. Those themes were: 1) increasing UBF numbers (through invitations to Bible study and worship service, called "fishing"), and 2) the Great Commission of Matthew 28: 19,20. One consequence of this practice was that Sunday messages and Bible studies were the same year after year, in UBF chapters all over the world.
2. Studying theological literature on one's own was discouraged and even disallowed unless it suited Lee's own purposes. All personal testimonies which were to be shared publicly at meetings were generally supposed to closely follow, even copy Lee's own message manuscripts. Any departure from these by a member were forced to be corrected by that member until they matched Lee's own manuscript themes. Any personal or individual touches in a member's testimony were mostly self-disparagement by the member or in praise of UBF leaders.
3. Fellowship leaders who carried out the duty of Sunday message delivery were called "pastors" by all members, and even wore ministerial robes during Sunday worship service, even though non of them were ordained ministers. This was to create a false impression of being a church, which UBF is not.
4. Lee had the last word in choice of music and how the orchestra was conducted, even though he had absolutely no background in orchestral music and little knowledge of classical music although he would often brag about it as though he did.
5. Members in UBF tended not to criticize or admit the many unethical, not to mention un-Christian behaviors that were (and probably still are going on) much less tried to change them, even though many of the members were fully aware of them. If they did, they received "discipline" of one form or another to keep quiet, or in fact just left UBF as many did and hopefully will continue to do so.
6. Those who left UBF after having become aware of the unethical, un-Christian practices were unfairly and even scandalously criticized without basis. Ironically, UBF lost most of its really good people (much better than me) years ago in this way!
Is it sad that UBF became a cult, but it did. I hope anyone reading this who is a current member of UBF can have the courage and independent faith to look around with eyes open, do some honest self-examination, and get out, and find an authentic church somewhere by God's grace. You will notice a very positive difference in your Christian life if you do.