What is the controversy with Alpha Course?

Could you elaborate on the controversies surrounding the Alpha Course? Have there been any criticisms about its teachings, methodology, or effectiveness? How do proponents and opponents of the Alpha Course differ in their opinions, and what are the main arguments on both sides? Additionally, has the Alpha Course faced any backlash from religious or secular organizations, and if so, what were the reasons behind it? I'm interested in hearing a balanced view of the controversy surrounding this program.