"The officials of the Islamic regime of Iran, and the members of the anti-Baha'i groups in Iran, have long accused the Baha'is to distort the religion of Islam. Also, they have claimed that Bahai's have acted as the tools of the foreign powers in Iran. Of course, as far as the first accusation is concerned, Shiites are themselves under attack by the majority of the Muslims that are Sunnis to do the same thing. Many Sunnis do not accept Shiites as the followers of Islam at all.
Regarding the second one, the interesting point is that the Bahai's have been accused of being foreign allies of the British, the Americans and even the Russians in Iran. The wide spectrum of these accusations reveals their baselessness. The real reason of the hostility of the Islamic governments, especially Iranian regime, towards the Baha'is, is explained by Bernard Lewis, the famous Philosopher, who has said, "...the Muslim piety and Islamic authorities have always had great difficulty in accommodating post-Islamic monotheistic religions such as Baha'is... [whose]their very existence presents a challenge to the Islamic doctrine of the perfection and finality of Muhammad's revelation".
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Those of Iranians that feel a kind of baseless hostility towards the Bahai's, and those who think that Bahai's are a disgrace to the Shiite Islam, shall pause and think of the situation of Shiites in the Islamic world. 90% of the Muslims (Sunnis) think of the Shiites the same way."
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Who are Baha'is and why the regime of Iran hates them?