The disciples expected that Christ would "come" as King, with a royal presence, and to remove the Romans and thrown down the corrupt temple, all at the same time and soon! It was a disappointment for them it turned not out that way, but they came to understand we could have an even much better future because of what Jesus had done. Though they also became convinced of the necessity to be prepared for the time that Jesus would return and that each believer could add by his effort of preaching, to bring the time closer.
Before calling a church or religious group a "cult" or "sect" one should seriously examine and clarify what one means with those qualifications.
For matters that happened in the first century of our common era historians of the first century like Tacitus, Josephus and later ancient writers like Africanus provided enough material to go and further Alexandrian manuscripts, findings from the Qumram caves and research from contemporary archaeologists and historians like Blomberg, Henry, Scott, Tabor, Droge, Ramsay, Samuelsson and many others.