I just bring it up, because some Baha'is point out that a new messenger comes with a new message, because the old messenger's religion has reached the end of its usefulness. Some use the seasons of the year to say those old religions had their spring and summer and are now in their autumn and winter. But most all the major religions get fresh life and revive themselves. They are far from being down for the count. Unfortunately, some Baha'is make it sound like there is nothing useful left in any of the older religions... that it's time to jump on the Baha'i train and ride it into a new age.
I posted some words of the Guardian earlier in this thread to another. It should make clear the approach you observe is not supported by the Baha’i writings
Shoghi Effendi, the leader of the Baha’i Faith from 1921-1957 and authorised interpreter of the Baha’i Writings makes some very strong statements about the Baha’i writings approach to religion, specifically Islam and Christianity.
The Faith standing identified with the name of Bahá’u’lláh disclaims any intention to belittle any of the Prophets gone before Him, to whittle down any of their teachings, to obscure, however slightly, the radiance of their Revelations, to oust them from the hearts of their followers, to abrogate the fundamentals of their doctrines, to discard any of their revealed Books, or to suppress the legitimate aspirations of their adherents. Repudiating the claim of any religion to be the final revelation of God to man, disclaiming finality for His own Revelation, Bahá’u’lláh inculcates the basic principle of the relativity of religious truth, the continuity of Divine Revelation, the progressiveness of religious experience. His aim is to widen the basis of all revealed religions and to unravel the mysteries of their scriptures. He insists on the unqualified recognition of the unity of their purpose, restates the eternal verities they enshrine, coordinates their functions, distinguishes the essential and the authentic from the nonessential and spurious in their teachings, separates the God-given truths from the priest-prompted superstitions, and on this as a basis proclaims the possibility, and even prophecies the inevitability, of their unification, and the consummation of their highest hopes.
Bahá'í Reference Library - The Promised Day Is Come, Pages 108-113
Later in the passage Shoghi Effendi further elaborates while quoting Bahá’u’lláh:
Nor should it be thought for a moment that the followers of Bahá’u’lláh either seek to degrade or even belittle the rank of the world’s religious leaders, whether Christian, Muslim, or of any other denomination, should their conduct conform to their professions, and be worthy of the position they occupy. “Those divines,” Bahá’u’lláh has affirmed, “…who are truly adorned with the ornament of knowledge and of a goodly character are, verily, as a head to the body of the world, and as eyes to the nations. The guidance of men hath, at all times, been and is dependent upon these blessed souls.” And again: “The divine whose conduct is upright, and the sage who is just, are as the spirit unto the body of the world. Well is it with that divine whose head is attired with the crown of justice, and whose temple is adorned with the ornament of equity.” And yet again: “The divine who hath seized and quaffed the most holy Wine, in the name of the sovereign Ordainer, is as an eye unto the world. Well is it with them who obey him, and call him to remembrance.” “Great is the blessedness of that divine,” He, in another connection, has written, “that hath not allowed knowledge to become a veil between him and the One Who is the Object of all knowledge, and who, when the Self-Subsisting appeared, hath turned with a beaming face towards Him. He, in truth, is numbered with the learned. The inmates of Paradise seek the blessing of his breath, and his lamp sheddeth its radiance over all who are in heaven and on earth. He, verily, is numbered with the inheritors of the Prophets. He that beholdeth him hath, verily, beheld the True One, and he that turneth towards him hath, verily, turned towards God, the Almighty, the All-Wise.” “Respect ye the divines amongst you,” is His exhortation, “They whose acts conform to the knowledge they possess, who observe the statutes of God, and decree the things God hath decreed in the Book. Know ye that they are the lamps of guidance betwixt earth and heaven. They that have no consideration for the position and merit of the divines amongst them have, verily, altered the bounty of God vouchsafed unto them.”
Is progressive revelation believable?