That's NOT the spirit of Genesis 4:9.
Actually, it is more scary and likely more truthful that Obama very well means it in the fashion used in Gen 4:9.
It doesn’t imply he intends to defend our honor and freedom, rather he might very well believe he is more capable than all of his brethren and has the authority to deny the freedom and liberty of his brethren whenever he sees fit.
Such a concept though, was mentioned in denial, as a lie by a murderer in Scripture. The acceptance of being another’s keeper is not promoted in the passage, nor could one properly call such a concept as “Christian”. On the contrary, a good argument can be made that a believer in Christ places faith in Christ first, and doesn’t attempt to counterfeit the role of God in the lives of his brethren as a substitute for faith in Christ in all things.
His position is more antiChristian, than Christian.