Atman is then the spark of Brahman that happens to make you youYes. The stuff of the objective world (matter), when organised appropriately by the organism which is our physical body, gives rise to consciousness, to the "I am".
I like this bit from Exodus 3, v13 & 14 ...
13 And Moses said unto God Behold, when I come unto the children of Israel, and shall say unto them, The God of your fathers hath sent me unto you; and they shall say to me, What is his name? what shall I say unto them?
14 And God said unto Moses, I AM THAT I AM: and he said, Thus shalt thou say unto the children of Israel, I AM hath sent me unto you.
