You are not engaging the text. You cannot (properly anyway) address my challenge simply by quoting other texts.
So I will repeat - how can the Romans 11 material be read as anything other than a warning to the believing Gentile that final loss is a possibility. Please address the Romans 11 text itself and explain how it can be read as anything other than a warning about the possibility of final loss for the believing Gentile.
The Gentiles are not being grafted into Christ, but into a Covenant relationship...such as the nation of Israel had where some believed and some didn't. Those who don't believe will be cut off.