You should believed in bitcoin if you have investment and i think you are here because you believed that you can earn lot of money in terms of bitcoin because people who does not know about bitcoin is not a believer.
Even those people who do not believe in bitcoin because they are not aware of it. They will definately believe in it from the moment you introduce and explain to them what bitcoin is all about and how it helps lives. More particularly, the investment benefits of bitcoin will make anyone attracted toward bitcoin ecosystem for sure.