When will mankind adopt the Faith ?

Once Varqa asked Baha'u'llah, "How will the Cause of God be universally adopted by mankind?" Baha'u'llah said that first, the nations of the world would arm themselves with infernal engines of war, and when fully armed would attack each other like bloodthirsty beasts. As a result, there would be anormous bloodshed throughout the world. Then the wise men from all nations would gather together to investigate the cause of such bloodshed. They would come to the conclusion that prejudices were the cause, a major form being religious prejudice. They would therefore try to eliminate religion so as to eliminate prejudice. Later they would realize that man cannot live without religion. Then they would study the teachings of all religions to see which of the religions conformed to the prevailing conditions of the time. It is then that the Cause of God would become universal.

~ Revelation of Baha'u'llah, vol. 4, p.56