Abram. God called Abram (later renamed as Abraham).

Paraman is the seventh-generation forefather in Thamizh. This gave rise to Brahman and Brahmin. The Aryans that invaded Thamizhagam (originally the whole of India) usurped this name to mean “good man”. (Their creator god was also named Brahma). Sara-swathi is a fallout of Sarai, Abram’s wife. This third river disappeared (!) leaving behind Ganga (Pison) in the land of Havilah (Barath(am) / varadham – boon or blessing of God with “good” gold and precious stones according to the Bible) and Jamuna. Pison is a brook in the northern mountains of India running even today.

Per http://www.history-perspective.com/timeline_flood_to_egypt.html Abram should have lived alongside Noah, the hero of Faith in the Flood narrative, for at least sixty years. So, there is a enough possibility, Abram heard about the Flood first-hand from Noah. But the whole earth was degenerating because of the idol worship that pervaded the planet through Nimrod (Murugan / Marduk). Abram would have also been a contemporary of Nimrod (Marduk / Murugan). Turn to every direction and people were worshipping idols and phallus sculptures. Many green trees were cut down, leaving their stumps standing, to be worshipped as god. This was harlotry and an abomination to the living God who created the heavens and the earth.

Here is a story from Jewish tradition (Midrash Bereishit 38:13) about Abram and his father’s idols.
Abraham's father, Terach was an idol-manufacturer. Once he had to travel, so he left Abraham to manage the shop. People would come in and ask to buy idols. Abraham would say, "How old are you?" The person would say, "Fifty," or "Sixty". Abraham would say, "Isn't it pathetic that a man of sixty wants to bow down to a one-day-old idol?"

Once a woman came with a basket of bread. She said to Abraham, "Take this and offer it to the gods". Abraham got up, took a hammer in his hand, broke all the idols to pieces, and then put the hammer in the hand of the biggest idol among them.

When his father came back and saw the broken idols, he was appalled. "Who did this?" he cried. Abraham replied calmly. "A woman came with a basket of bread and told me to offer it to them. I brought it in front of them, and each one said, "I'm going to eat first." Then the biggest one got up, took the hammer and broke all the others to pieces."

"What are you trying to pull on me?" asked Terach, "Do they have minds?"
Said Abraham: "Father, listen to what your own mouth is saying? They have no power at all! Why worship idols?"

People worship idols to attain to their own selfish ends – safety, food, prosperity and power; they worshipped one or more gods not just to pacify their deities. The gains that were behind such a worship was the motive for people to worship not just one god / goddess but as many as possible.

Each god (and the respective idol) that man worshipped is said to have power over one aspect of man’s needs and aspirations. Accordingly, (only the Indian gods are mentioned here but there are Greek, Roman and other eastern and middle eastern equivalents for each of these) there is a god for knowledge (Saraswathi), a god for wealth (Lakshmi), a god each for the forces of nature like fire (Agnidevan), wind (Vayu bagawan), rain (Varunan – Indira) and earthquake (bhoomadevi), a god for protection from enemies (Ayyanar), a god for courage and physical strength (Hanuman), the Sun god (Suryadevan), a moon god (Chandrn), a god named after every visible planet, constellation and star, a god for this and a god for that. In fact, an Indian tradition says that there are three hundred and thirty million gods. And, each god tends to gain an upper hand over the others and there is always a fight for supremacy – the reason for inter-religious and intra-religious conflicts and wars today. “My god is bigger than yours” is the attitude of all religious communities, a direct result of people worshipping a creation, or a creation of their own imagination all built by their own hands (and by machines 😊).

Alarmingly, there are very few people who worship their god(s) for forgiveness of sin and eternal life. A life on this earth in their temporal physical body is considered by them the only life but nobody cares for the eternal soul that will exist for ever after departure from this body. According to the word of God the Bible, those who seek God for forgiveness of sins and eternal life will live with Him in an immortal glorious body but those who will go to hell will live with Satan in a body that will not burn away and a soul that will retain sense of pain and agony for ever.

Nimrod worshiped fire. Fire could not be god because rain (water) could quench fire. Water could not be god because water-filled clouds could be driven by wind / spirit. Wind (a form of the spirit – unseen) could not be god because spirits (evil spirits as we know now) could be controlled by humans through their Kundalini power. Again, it returns to the source of this argument – man. Could sun be god? Darkness of the night overcame it. Could moon or the stars be god? Light of the morning overcame them. Abram should have been searching for the true God who should have power over everything – Sun, moon, stars, fire, water, wind and ultimately humans.

God always responds to a searching heart. He visited Abram.

Now the Lord had said unto Abram, Get thee out of thy country, and from thy kindred, and from thy father's house, unto a land that I will shew thee: And I will make of thee a great nation, and I will bless thee, and make thy name great; and thou shalt be a blessing: And I will bless them that bless thee, and curse him that curses thee: and in thee shall all families of the earth be blessed. – Gen 12:1-3.

By faith Abraham, when he was called to go out into a place which he should after receive for an inheritance, obeyed; - Heb 11:8.

Abram, when he was seventy-five years old, set out with his wife and a few others from “Ur” to the place God would show him. After a slight delay at Haran (Aran – safety) (due to his father’s unwillingness or illness?), Abram reached the God’s promised land – Canaan (Kaanagam – rich vegetation with milk and honey; also from Canaan – dark skinned (Kannan)). There he built an altar unto the Lord and worshipped Him (and sacrificed an innocent animal?) as a mark of faith in the Lord who had promised him a Seed.