No, Your problem is with the OT. Paul is talking about the eternal heavenly promise. Not the physical land given to Israel. Which NEVER had as thing to do with salvation.
I pointed you to 5 places in the OT that Paul specifically referenced in Galatians 3:16, and they all specify to whom the land was unconditionally promised. Those verses have nothing to do with any other promise. Again, you are openly contradicting what Paul taught.