Much as been written (as rightfully so) about the faith of Abraham, but Isaac himself showed that he also had faith in the book of Genesis. Isaac was the only son of Abraham and Sarah and he was the son of promise, as the Messiah would eventually be born from Issac's lineage.
Genesis 22:17-18
I will indeed bless you and make your offspring as numerous as the stars in the sky and the sand on the seashore. Your offspring will possess the gates of their enemies. 18 And all the nations of the earth will be blessed by your offspring because you have obeyed My command."
Genesis 22 is typically used to detail Abraham's faith and obedience and it does indeed show that, but we must not forget about Issac's obedience in this chapter as well.
Genesis 22:1-14
22 After these things God tested Abraham and said to him, "Abraham!"
"Here I am," he answered.
2 "Take your son," He said, "your only son Isaac, whom you love, go to the land of Moriah, and offer him there as a burnt offering on one of the mountains I will tell you about."
3 So early in the morning Abraham got up, saddled his donkey, and took with him two of his young men and his son Isaac. He split wood for a burnt offering and set out to go to the place God had told him about. 4 On the third day Abraham looked up and saw the place in the distance. 5 Then Abraham said to his young men, "Stay here with the donkey. The boy and I will go over there to worship; then we'll come back to you." 6 Abraham took the wood for the burnt offering and laid it on his son Isaac. In his hand he took the fire and the sacrificial knife, and the two of them walked on together.
7 Then Isaac spoke to his father Abraham and said, "My father."
And he replied, "Here I am, my son."
Isaac said, "The fire and the wood are here, but where is the lamb for the burnt offering?"
8 Abraham answered, "God Himself will provide the lamb for the burnt offering, my son." Then the two of them walked on together.
9 When they arrived at the place that God had told him about, Abraham built the altar there and arranged the wood. He bound his son Isaac and placed him on the altar, on top of the wood. 10 Then Abraham reached out and took the knife to slaughter his son. 11 But the Angel of the Lord called to him from heaven and said, "Abraham, Abraham!"
He replied, "Here I am."
12 Then He said, "Do not lay a hand on the boy or do anything to him. For now I know that you fear God, since you have not withheld your only son from Me." 13 Abraham looked up and saw a ram caught by its horns in the thicket. So Abraham went and took the ram and offered it as a burnt offering in place of his son. 14 And Abraham named that place The Lord Will Provide, so today it is said: "It will be provided on the Lord's mountain."
While we see here that Abraham trusted in God explicitly and believed that God would raise up Isaac we must not lose site of Isaac. Many scholars believe Isaac was in his late teens to early twenties during this passage. This is based on the context of the preceding chapters and the fact he's able to carry the wood that Abraham hoisted upon him. If that was the case, and I believe it so, we can assume Abraham was around 120 years old. Clearly Isaac was quite capable of stopping and overpowering Abraham if he really wanted too. Yet he allowed himself to be tied up, placed on the alter and seemingly let the knife be plunged into his chest.
Another example of Isaac's faith is in Chapter 25 of Genesis
Genesis 25:21-22
Isaac prayed to the Lord on behalf of his wife because she was barren. The Lord heard his prayer, and his wife Rebekah conceived.
And also chapter 26 is another example of Isaac obeying God
Genesis 26:1-6
26 There was another famine in the land in addition to the one that had occurred in Abraham's time. And Isaac went to Abimelech, king of the Philistines, at Gerar. 2 The Lord appeared to him and said, "Do not go down to Egypt. Live in the land that I tell you about; 3 stay in this land as a foreigner, and I will be with you and bless you. For I will give all these lands to you and your offspring, and I will confirm the oath that I swore to your father Abraham. 4 I will make your offspring as numerous as the stars of the sky, I will give your offspring all these lands, and all the nations of the earth will be blessed by your offspring, 5 because Abraham listened to My voice and kept My mandate, My commands, My statutes, and My instructions." 6 So Isaac settled in Gerar.
While all of the attention is directed to Abraham, we would be remiss to note how Abraham's walk of faith inspired his son's obedience and walk of faith. Isaac believed his father that God would provide a sacrifice, and was obedient to the point of death, he also was shown as one who prayed. He was married at age 40 and 30 years had transpired but God had listened to his prayer and Rebekah conceived. Likewise when the Lord spoke to him, he obeyed, and instead of heading down to Egypt, he stayed in the land of Canaan.
He wasn't perfect and he also picked up his father's penchant of lying.He wasn't perfect and he also picked up his father's penchant of lying.
Genesis 26:7-8
7 When the men of the place asked about his wife, he said, "She is my sister," for he was afraid to say "my wife," thinking, "The men of the place will kill me on account of Rebekah, for she is a beautiful woman."
Clearly this very act occurred to his father two times beforehand. It also illustrates that while both Abraham and Isaac were righteous, they were not perfect or sinless. It should server as motivation for modern day believers to trust in God and understand that we are a work in progress. We all have short comings but with faith in God we can deal with them.
To summarize, Abraham was faithful to God, and without hesitation about to sacrifice his one and only son. Yet Isaac was not some little child, but rather a young man quite capable of stopping this whole trial, but he didn't. We also see that Isaac demonstrated prayer and faith in the subsequent chapters. While it seems Isaac's life in the book of Genesis is a parenthetical hold over to get from Abraham to Jacob, there's no denying the fact he had faith and trusted in God.