Abdul Baha seems to be separating God from His creation if I understand him correctly. From a Hindu perspective, there is the Absolute Spirit (Unmanifested God) and Creation (Manifested God). The reason Creation is considered Manifested God is because it is nothing but solidified vibratory power of God. Think about it this way. An ocean is a huge mass of water but an ice berg in the ocean is made from the ocean's water and is floating in the ocean. So you can say a little bit of the ocean has become the ice berg or the ocean is in the ice berg and the ice berg is in the ocean. Like wise, Creation is in God and God is in the Creation.Great to see you here Venu. It would be right to point out from the start that Abdul'baha's explanations are authorised by Baha'u'llah, no one knew the Revelation of Baha'u'llah any better than Abdul'baha. Baha'u'llah gifted Abdul'baha to us as 'The Mystery of God' and it is Abdul'baha that is the of 'Servant of Baha'.
Thus the Authority given to Abdul'baha cannot be seperated from the Message of Baha'u'llah.
This is the full explanation (Also new translation) that is referenced in the talk of your above quote.
1Question: What isthe meaning of the Trinity and of its three Persons?
(Some Answered Questions)
No Baha'i can offer a better explanation as this explanation has the authority given of God, we can only offer thoughts.
I will try to get back later to some of your other points posted above.
From a scientific perspective, something cannot come out of nothing. From what did this creation come out of and if it did not come out of God, who made the 'thing' out which this creation came? If God made the 'thing' out of which this creation came, how did God make the 'thing'? It all goes back to God. Everything came out of God and God's creative intelligence (only begotten Son) and vibratory power (Aum - Holy Ghost - the Word) made the creation possible.
When God first thought of creation, the thought process creation a vibration ( Aum of the Hindu Scriptures, the Word of the Bible, Ameen of the Arabs, Amen of Europeans). From the word came the light which solidified in to physical mass. That truth applies to the human body as well which is why the Bible says the Word was made flesh. The human mind and body came out of AUM and chanting AUM will harmonize the mind and body and help connect the soul with Spirit. You are the proof of Trinity. Your soul represents Father, your body represents Holy Ghost and the Creative Intelligence within you which is centered at the spiritual eye (point between the eye brows) represents the Son (only begotten Son). If you realize the true nature of your self as Bahaullah is asking you to do, then you realize that you always have been one with God and like Jesus you can say "I and my Father are one"; "I am in the Father and the Father is within me". You can also perform miracle like Jesus did. The best way to realizing your self is through meditation which Bahaullah also encouraged. When you meditate, your spiritual eye opens and your body no longer appears solid. You will see it as light coming out of AUM vibration (Matthew 6:22).
In the beginning was the Word, and the Word was with God, and the Word was God.......And the Word was made flesh, and dwelt among us - Bible
Very truly I tell you, whoever believes in me will do the works I have been doing, and they will do even greater things than these, because I am going to the Father. - John 14:12
Jesus answered and said unto them, Verily I say unto you, If ye have faith, and doubt not, ye shall not only do this which is done to the fig tree, but also if ye shall say unto this mountain, Be thou removed, and be thou cast into the sea; it shall be done. - Matthew 21:21
The light of the body is the eye: if therefore thine eye be single, thy whole body shall be full of light - Matthew 6:22