What then? If some did not believe or were unfaithful [to God], their lack of belief will not nullify and make invalid the faithfulness of God and His word, will it?

For if we have become one with Him [permanently united] in the likeness of His death, we will also certainly be [one with Him and share fully] in the likeness of His resurrection.

And Isaiah calls out concerning Israel: “Though the number of the sons of Israel be like the sand of the sea, it is only the remnant [a small believing minority] that will be saved [from God’s judgment];

It is as Isaiah foretold,

“If the Lord of Hosts had not left us seed [future generations from which a believing remnant of Israelites came],
We would have become like Sodom, and would have resembled Gomorrah [totally rejected and destroyed]!”

And David says,

“Let their table (abundance) become a snare and a trap,
A stumbling block and a retribution to them.

That is true. They were broken off because of their unbelief, but you stand by your faith [as believers understanding the truth of Christ’s deity]. Do not be conceited, but [rather stand in great awe of God and] fear [Him];

never lagging behind in diligence; aglow in the Spirit, enthusiastically serving the Lord;

The one who eats [everything] is not to look down on the one who does not eat, and the one who does not eat must not criticize or pass judgment on the one who eats [everything], for God has accepted him.

But you, why do you criticize your brother? Or you again, why do you look down on your [believing] brother or regard him with contempt? For we will all stand before the judgment seat of God [who alone is judge].