Rahab being on the list in Hebrews 11 loudly proclaims that you don't have to have a good background in order to be a Christian.
By faith the people crossed the Red Sea as on dry land, but the Egyptians, when they attempted to do the same, were drowned. - Hebrews 11:29
The true Christian is the most logical person in the world because by faith he has done the math right and calculated correctly.
Hebrews 11 gives some of the most helpful statements made about faith in all of the Bible, as far as identifying where faith is.
By faith Sarah herself received power to conceive, even when she was past the age, since she considered him faithful who had promised. - Hebrews 11:11
Faith is building a life on what God says. That's believing. Saving faith does not run from the unknown.
Noah was basing his whole life and decisions on something unseen... on a God who is unseen, who warned him about an unseen flood.
There is nothing recorded in the Bible of what Abel actually said. So how does his offering speak to us? We must look at his life and see what it says about faith and imitate it.
For in Christ Jesus neither circumcision nor uncircumcision counts for anything, but only faith working through love. - Galatians 5:6
Simon, Simon, behold, Satan has demanded permission to sift you like wheat; but I have prayed for you, that your faith may not fail; and you, when once you have turned again, strengthen your brothers. - Luke 22:31-32
God does have absolutes. There is only one opinion that matters and it's not our opinion, it's God's.