You have to investigate for yourself.
“The first principle Baha’u’llah urged was the independent investigation of truth. “Each individual,” He said, “is following the faith of his ancestors who themselves are lost in the maze of tradition. Reality is steeped in dogmas and doctrines. If each investigate for himself, he will find that Reality is one; does not admit of multiplicity; is not divisible. All will find the same foundation and all will be at peace.” –
Abdu’l-Baha,
Star of the West, Volume 3, p. 5.
“Bahá’u’lláh asked no one to accept His statements and His tokens blindly. On the contrary, He put in the very forefront of His teachings emphatic warnings against blind acceptance of authority, and urged all to open their eyes and ears, and use their own judgement, independently and fearlessly, in order to ascertain the truth. He enjoined the fullest investigation and never concealed Himself, offering, as the supreme proofs of His Prophethood, His words and works and their effects in transforming the lives and characters of men.”
Bahá’u’lláh and the New Era, p. 8
“What does it mean to investigate reality? It means that man must forget all hearsay and examine truth himself, for he does not know whether statements he hears are in accordance with reality or not. Wherever he finds truth or reality, he must hold to it, forsaking, discarding all else; for outside of reality there is naught but superstition and imagination.” –
Abdu’l-Baha,
The Promulgation of Universal Peace, p. 62.
If you want to know HOW to independently investigate the Truth, you can watch this short video.