I will address a few points.
﴾وَقَالَتِ الْيَهُودُ وَالنَّصَارَىٰ نَحْنُ أَبْنَاءُ اللَّهِ وَأَحِبَّاؤُهُ قُلْ فَلِمَ يُعَذِّبُكُم بِذُنُوبِكُم بَلْ أَنتُم بَشَرٌ مِّمَّنْ خَلَقَ﴿ "And the Jews and the Christians say, 'We are the children of God, and His beloved ones.' Say, 'Why then does He punish you for your sins?' Nay, but you are mortals of His creating" (Qur'an 5:18).
Nor could He contain positive traits, since these make Him similar to His creatures and constitute a subtle form of anthropomorphism (
tashbih). He is rather above both positive
and negative attributes, above both the good and the not-good, which are both His creations: ﴾وَإِن تُصِبْهُمْ حَسَنَةٌ يَقُولُوا هَٰذِهِ مِنْ عِندِ اللَّهِ وَإِن تُصِبْهُمْ سَيِّئَةٌ يَقُولُوا هَٰذِهِ مِنْ عِندِكَ قُلْ كُلٌّ مِّنْ عِندِ اللَّهِ﴿ "And if good befalls them, they say, 'This is from God,' but if evil befalls them, they say, 'This is from thee.' Say, “All is from God" (Qur'an 4:78).
1. They're nothing compared to the Qur'an.
2. The real story of Baha'u'llah's life is a lot less saintly than the hagiographical narrative parroted by Shoghi Effendi and later Baha'i authors. That's how it works. You remove all the negative aspects of their life, embellish some things here and here, stretch the truth whenever it's convenient. You can make anyone's life seem like the life of a prophet. For example, look at the official Scientology "biographies of L. Ron Hubbard.
3. All the cult leaders you named had a profound effect on the people they met. How do you think they gained followers?
4. Hardly.
5. He did not. Islam teaches the idea of progressive revelation, and so many movements in Islam such as the Isma'ilis recognized this and articulated it similarly to the Bab, the one from whom Baha'u'llah copied this idea.
Rashid Rida refuted this tired old argument way back in 1900 when Gulpaygani was first popularizing it. A religion doesn't need to be true to spread; it just needs good propaganda. And the Qur'an explicitly tells us
not to follow the crowd: ﴾وَإِن تُطِعْ أَكْثَرَ مَن فِي الْأَرْضِ يُضِلُّوكَ عَن سَبِيلِ اللَّهِ﴿ "Wert thou to obey most of those on earth, they would lead thee astray from the way of God" (6:116).
No such unequivocal claim exists in the
Iqan.