Read Romans 11 again please.
Wmfights, the blessing and curse is not found just in Genesis
Read Numbers 24
8 "God brought them out of Egypt;
they have the strength of a wild ox.
They devour hostile nations
and break their bones in pieces;
with their arrows they pierce them.
9 Like a lion they crouch and lie down,
like a lionesswho dares to rouse them?
"May those who bless you be blessed
and those who curse you be cursed!"
This was Balaam's prophecy which God gave him in spite of Balak's intentions.
Genesis 27:29 repeats the blessing and curse in Isaac's blessing of Jacob.
May nations serve you
and peoples bow down to you.
Be lord over your brothers,
and may the sons of your mother bow down to you.
May those who curse you be cursed
and those who bless you be blessed."
Say what you will, but there is more exegetically in Scripture that says the blessing is for Israel than there is eisegetically to say it is for anyone.