When I accepted an old earth, this always bugged me. The Bible strongly implies that the earth is thousands of years old, and it’s what virtually all Christians believed until the 1700s. Chrysostom, Origen, Augustine, Aquinas, Luther, Calvin, everybody thought the earth was young because of pretty reasonable exegesis. Presumably, God could have revealed in Scripture that the earth is not just thousands of years somehow. If He couldn’t, couldn’t He have at least created an earth in thousands of years instead?
What made matters worse for me was seeing how the people who first argued for an old earth were deists, not Christians. They explicitly rejected biblical cosmology to begin with. With evolution, it’s worse, seeing as Darwin was an atheist.
It’s pretty hard to dispute that the rise in belief in old earth and evolution has helped lead to secularization. This being the case, why would God allow things to go this way on an old earth view? I’m not asking this rhetorically, it just bugged me a lot when I was old earth, and now that I’m young earth it makes sense that systems of unbelief rise over time and this would just be another, so it’s not a problem of God’s providence.