Why did God created us?
God created us out of free and unselfish love.
Here's an analogy for us to understand better. When a man loves, his heart overflows and he would like to share his joy with others. where does the joy come from? Of course from his Creator.
Although God is a mystery, we can still think about Him in a human way and say: out of the Surplus of His love, He created us! =)
He wanted to share His endless love and joy with us, who are creatures of his love ^^
"God is love" - 1 John 4.16