Here's one:
15 After these things the word of the Lord came to Abram in a vision: “Fear not, Abram, I am your shield; your reward shall be very great.” 2 But Abram said, “O Lord God, what will you give me, for I continue childless, and the heir of my house is Eliezer of Damascus?” 3 And Abram said, “Behold, you have given me no offspring, and a member of my household will be my heir.” 4 And behold, the word of the Lord came to him: “This man shall not be your heir; your very own son shall be your heir.” 5 And he brought him outside and said, “Look toward heaven, and number the stars, if you are able to number them.” Then he said to him, “So shall your offspring be.” 6 And he believed the Lord, and he counted it to him as righteousness.
The Holy Bible: English Standard Version. (2001). (Ge 15:1–6). Wheaton: Standard Bible Society.
Here God promises that a son will come from his body who will be Abraham's heir (heir of the promises - land of Canaan included) and will multiply to become an innumerable people.
This son, ultimately, is Jesus Christ. As Abraham "believed God" here he believed in Jesus Christ.
Yes he is. Isaac prefigured Jesus as being the miracle son who must be sacrificed.
Let me ask you a question. If Abraham didn't believe in Christ, how can he be said to be saved?