And I agree. The Gospel, in and of itself, is easily understood even without spiritual thinking. But that is not the same thing that 1 Corinthians is talking about. Notice in my reply to you I said anyone can understand the Gospel at a rudimentary level, not at the deep spiritual levels.
There is no "deep spiritual level" to the gospel. It's simple and easy to understand.
The context of 1 Cor. 2 is not the gospel, it's the deep things of God.
The context of 1 Cor 2 is understanding "spiritual wisdom" (v. 6) the "hidden wisdom of God" (v. 7), the "deep things of God" (v. 10), and the "spiritual things the Holy Spirit teaches" (v. 13).
The natural man (unsaved man) does not understand these deeper things of God. But God has revealed the Gospel to everyone and the unsaved man CAN understand the Gospel.