What "old-earth creationists" (including, to a large degree, even the evangelical ones) are doing with Genesis 1-3 is precisely what religious liberals have always done with all of Scripture—spiritualizing and reinterpreting the text allegorically to make it mean what they want it to mean. It is a dangerous way to handle Scripture. And it involves a perilous and unnecessary capitulation to the religious presuppositions of naturalism—not to mention a serious dishonor to God.
Evangelicals who accept an old-earth interpretation of Genesis have embraced a hermeneutic that is hostile to a high view of Scripture. They are bringing to the opening chapters of Scripture a method of biblical interpretation that has built-in anti-evangelical presuppositions. Those who adopt this approach have already embarked on a process that invariably overthrows faith. Churches and colleges that embrace this view will not remain evangelical long.
I would suggest that they aren't evangelical at all. They are attacking God and His Word just as Satan did in the Garden with Eve--and for the SAME THING: knowledge outside of God's Word: "Hath God said?". Their faith MUST be questioned:
Heb 11:1 Now faith is the assurance of things hoped for, the conviction of things not seen.
Heb 11:2 For by it the people of old received their commendation.
Heb 11:3 By faith we understand that the universe was created by the word of God, so that what is seen was not made out of things that are visible.