Why did God tell Abram to leave his country and to get away from his kindred?
This was before God changed Abram's name to Abraham. Abram was raised in a pagan culture that believed in many gods. God knew that for him to stay in his country with his family would be detrimental to his spiritual growth. In fact, his family and friends would not help, but hinder him. So God called Abram from among them.
Abram wasn't allowed to take time to put his mail on hold or to stop his cable service. He wasn't allowed time to let his neighbors know he was leaving the country. Abram wasn't given time to think about the order. He had to leave immediately according to God's command.
And when the Lord told Abram to leave his family and country, it didn't make sense at the moment. But he would later understand the plan and purpose of God.
The Lord was essentially asking Abram to trade in one thing, and He would give him something else in its place. God told Abram to leave his family, but God promised him he would be the "Father of Many Nations." God told Abram to leave the small plot of land he was living on, and God gave him land as far as he could see along with riches.
"All the land that you see I will give to you and your offspring forever. I will make your offspring like the dust of the earth, so that if anyone could count the dust, then your offspring could be counted. Go, walk through the length and breadth of the land, for I am giving it to you." (Genesis 13:15-17)
At the time God made this promise to Abram, he was seventy-five years old and his wife was sixty-five and barren. The promise didn't seem logical at the time.
Did God do what He promised? Did He make of Abram a great nation? Did He give the land of Palestine to Abram's descendants? He surely did. Why was God so willing to keep His promise? It is all summed up in just three words according to Genesis 12:4, "And Abram went."