A Gospel without the knowledge of God and his ways at the very core is essentially a false Gospel.
Would you mind sharing a little bit of what you mean by knowledge of God?
Knowing him. Having a personal, living relationship with him. Walking with him, being dealt with by him. When everything else has been stripped away and all you have left to rely on is God and his promise, when only he can help you and sustain you and you no longer have any resources of your own to rely on, then you quickly discover what it means to know God, rather than just some creed, doctrine, or words on a page. Most Christians in America would fail this test in a heartbeat, which is exactly the problem I am trying to speak to. There’s not enough space here to give a complete testimony, but trust me, I’ve been through everything I’ve just described, and seen too many other people—in some cases friends—fall by the wayside because of comparatively minor trials, so I know what I’m talking about. There has to be more to one’s relation with God than just church, Bible study, hymns, and early morning devotionals if you really want to get through times of trouble. You have to know him.