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john said:
When I was talking to my friend, I had mentioned that the foreshadowing of Christ in 3:15 and the clothing of Adam and Eve showing God's favor toward them as reasons why I thought they were elect.

I believe there might be another reason to conclude that Adam and Eve were saved.

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Now the man had relations with his wife Eve, and she conceived and gave birth to Cain, and she said, "I have gotten a manchild with the help of the Lord." [Gen 4:1]

Please note that Eve spoke of the Lord in faith and even though she was quite wrong about Cain, she had apparently remembered God's promise of the Messianic seed.

Denny

Romans 3:22-24

Denny

Simon Peter answered Him, "Lord, to whom shall we go? You have the words of eternal life." [John 6:68]