There are things most people on Earth believe to be true. We believe the sun is a star and the basic physics of it as well as it's motion. A God would surely understand what evidence would convince everyone and would have no problem knowing and producing the evidence if it felt this was important.
In the future far less people will believe Bahai and other beliefs based on bad evidence (incorrect science, no actual prophecy, no accurate predictions, no philosophy, poetry that could be easily written by men) as if a God only wanted people who would believe based on terrible evidence?
And clearly people do just that. The evidence for Mormonism is terrible. In the 70s an Ethiopian Emperor who claimed not to be a God and was a confessed Christian died and not long after myths about him were created - his coming was prophesied in the OT, his birth was accompanied by miracles, he was a child with immense wisdom and powers, his actions were prefigured in the OT, performed miracles, was an incarnation of God, communicates with his followers after death and will one day return and live with his people in a kingdom of God. This is Haile Selassie of the Rastafari religion.
Critical thinking will hopefully win out before more "messengers" come and bring new radical versions of religions.