I am not defending the BKWSU and your observations are correct but there is the "Sura al noor" (Sura 24 - Ayat 35) which starts, "Allahu nooru ..." and Noor al-anwar (The Light of lights) is refered to in Sufism which influenced Islam of Sind. Islam also talks of the "Noor of Prophet Muhammad". I do agree though that it is a tenuous connection and so are the others that BKism makes to other religions in their posters. Its more a case of "me too-ism" and attempting to earn "credibility by association" to parts of the major religions.
What I do find similar in Brahma-kumarism, even Prajapita Brahma-kumarism, is the use of the term "proofs" referring to conceptual equations taken from their mystic documents. Islam also talks about "proofs" from the Koran, i.e. the proof that the Koran is God's word is because it says so. Likewise, BKs say that the Murli is God's word because the Murlis says it is (despite multiple evidence it has been changed and tampered with by humans).
But what this title refers to is something more hidden. The PBKs and, half-consciously, some BKs believe that the roots of all religions are within the Brahma Kumari religion. Therefore, the seeds of Islam are present within the BKWSU. What I understand from what I have read here is that the PBKs identify METAPHORICALLY Islamic tendencies within the BKWSU that infer that the leaders of the BKWSU are the Islamic faction within the Brahma Kumari movement ... just as there are Christian, Buddhist or Sanyasi factions within the movement, e.g. traffic control is related to Muslim prayers. I think these Islamicist BKs are accused of "invading" the Bharat of pure BK-ism.
For some reason, the God of the BKs has a real issue with Mahmud of Ghazni (971 – 1030), who destroyed the 3rd temple of Somnath. The BKs say they did it for the money ... Islam says it was to destroy the Pre-Islamic statue to the goddess of al-Manat (God’s 3rd daughter) which disappeared from Arabia and found a revered place in Somnath. Al-Manat was a triple-faced, Crone-goddess of Fate and the moon, one of the three daughters of "Hubal", the chief moon god known solely as Allah today, and worshipped as a black stone.
The Arabs had been pantheists worshipping 360 gods and planetary deities before Mohammed came and turned them into monotheists. They were engaged on erasing their real history just like the BKWSU.
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in the Koran it is wrote:Allah is the Light of the heavens and the earth. The parable of His Light is as (if there were) a niche and within it a lamp, the lamp is in glass, the glass as it were a brilliant star, lit from a blessed tree, an olive, neither of the east (i.e. neither it gets sun-rays only in the morning) nor of the West (i.e. nor it gets sun-rays only in the afternoon, but it is exposed to the sun all day long), whose oil would almost glow forth (of itself), though no fire touched it. Light upon Light! Allah guides to His Light whom He wills. And Allah sets forth parables for mankind, and Allah is All-Knower of everything.