1 Corinthians 15:1-2 NASB all by itself nullifies any OSAS one might try to squeeze out of a passage of scripture.
No it doesn't. There is nothing contradictory with someone once becoming saved then always remaining saved and 1 Cor 15:1-2. You act like I don't believe 1 Cor 15:1-2.
I do believe it.
All of it. No 'squeezeing out' of it is needed. And I believe OSAS too. No incompatibility exists between them as you keep claiming. 1 Cor 15 isn't part of the OP's ES case. It was brought up to squeeze out of the ES case by the old 'balancing Scripture against Scripture' squeeze. Next comes naming calling.
How in the world do you think Paul was so bold and confident in the believers still remaining saved (in the present) to write back to them claiming they still were saved from his previous visit? He was confident in the power they inherited at the time/place of their
past belief, that's why. They didn't just raise their hand and believe
superficially and without complete commitment, they were literally
reborn from above—spiritually transformed, renewed, and set apart for His purpose. Those that were truly saved that is. And Paul knew they were.
And I believe
all God's gifts and callings are irrevocable (Rom 11:29). Anti-OSAS "squeezes out" of Paul's plain OSAS teaching in Rom 11:29 by saying he can't mean all gifts, such as the gift of Eternal Life, because 1 Cor 15 (and John 15) is anti-OSAS.
Or that Paul only meant the gifts and calling He gave to Israel were irrevocable. I don't believe you have any evidence for either point. You've made no real Biblical case for either point. 1 Cor 15 is not anti-OSAS and Paul specifically called Eternal Life a gift. So the idea that it's not irrevocable is obvoiusly wrong. Just like it's obviously wrong that 1 Cor 15:1-2 is anti-OSAS. Even if it were anti-OSAS, all that would prove is Paul contradicted himself between these two books.
And I believe the Eternal Life that is a gift of God's is applicable to Roman Gentiles, just as it was to Israel. You do not.
We know from the context of this discourse about Israel what the gifts and calling of Israel are that are irrevocable:
"... (Romans 9:3-5 NASB)
And I believe Eternal Life is eternal (lasts forever). You do not.
They have been trained to automatically answer the question of whether eternal life means you have it forever and can not lose it with the argument that eternal life means you have it forever and can not lose it.
Yes I was trained to know the difference between eternal life versus temporary life many years ago. Probably about the time I was finishing potty training.