Mark 8:18 was specifically written for the protestants that were to come.
This might not be found in the Inspired Version...
...and it is suspect in the following:
Luke 8:43-48 King James Version (KJV)43 And a woman having an issue of blood twelve years, which had spent all her living upon physicians, neither could be healed of any,
44 Came behind him, and touched the border of his garment: and immediately her issue of blood stanched.
45 And Jesus said, Who touched me? When all denied, Peter and they that were with him said, Master, the multitude throng thee and press thee, and sayest thou, Who touched me?
46 And Jesus said, Somebody hath touched me: for I perceive that virtue is gone out of me.
47 And when the woman saw that she was not hid, she came trembling, and falling down before him, she declared unto him before all the people for what cause she had touched him, and how she was healed immediately.
48 And he said unto her, Daughter, be of good comfort: thy faith hath made thee whole; go in peace.
Keep it in context:
When was Abraham declared righteous?
What had he done for this?
In Genesis 26 you're equating the giving of the land with Abraham's righteousness....two different things. The covenant for the land came after he had been declared righteous.
God does not give salvation in one place and then take it back in another.
Now, as a follower of Christ do we do the things He's told us to do? You betcha. I don't know of a Christian who would say otherwise.
To use a sport analogy....when you're on the team you do what the coach says. .