Abraham = Brahma And Hagar = Gayatri

https://en.wikipedia.org/wiki/Hagar
https://hagarinternational.org
https://www.youtube.com/results?search_query=Hagar+islam

https://en.wikipedia.org/wiki/Ghaggar-Hakra_River
http://www.mapsofindia.com/history/sarasvati-river.html
https://www.youtube.com/results?search_query=Ghaggar+Hakra+River

Ten Hands

The following weapons are from Laxmi Vishnu: 

1. Lotus symbolizes creation (srshti bijam tatha padmam), 
2. Discus preservation (chakram sthiti -nibandhanam), 
3. Mace disolution (gadha samhara -bijam) and 
4. Conch emancipation of the soul from bondage ( samkham mukti-nihandhanam) 

Source
[Parama-samhita 3,17; and Brhat-brahma-samhita, 1,12,102-103]

The following are taken from Shiva Shakti

1. plate (kapalam) and 
2. pointed weapon (Malu) . 

The following are taken from Brahma Saraswati

1. One stick (writing tool) is from 
2. One more lotus, Mann Gayatri represents Mind. 

The right hand which shows Abhaya Mudra gives protection. The left hand which points down shows that Her feet are the sole refuge of the individual souls.

tirumalesa

http://www.tirumalesa.com/

Hoax and Real

https://ramanan50.wordpress.com/2015/03/17/gayatri-mantra-produces-sound-waves-hoax-and-real-study/

Five Faces

Gayathri is described as having five faces, Five Faces Goddess.

1. The first is “Aum”.
2. The second is “Bhoor bhuvas svah”. 
3. The third is “Thathsavithur Varenyam”.
4. The fourth is “Bhargo Devasya Dheemahie”. 
5. The fifth is”Dheeyo yo nah prachoedaaath”. Gayathri represents in these five faces the five Pranas(life forces).

http://www.sripanchamukhagayatri.org/

Sai

http://www.sathyasai.org/devotion/prayers/gayatri.html
http://scriptures.ru/gayatr_l.htm
http://www.saibabaofindia.com/gayatris_and_other_mantras_for_help_in_daily_life_welfare.htm
http://sbdsisaikat.wordpress.com/2013/02/20/the-five-faces-of-gayatri/
http://www.saibaba.ws/teachings/gayatrimantra.htm
http://viswakarmas.hpage.co.in/gayathri-manthra_38673019.html
 

Simonarich

http://simonarich.com/gayatri-mantra-chant

BSGP

http://www.bsgp.org/

Devotional

https://www.youtube.com/user/Devotional/search?query=Gayathri