The Book of Hebrews addresses three separate groups: believers in Christ, unbelievers who had knowledge of and an intellectual acceptance of the facts of Christ, and unbelievers who were attracted to Christ, but who rejected Him ultimately. It's important to understand which group is being addressed in which passage. To fail to do so can cause us to draw conclusions inconsistent with the rest of Scripture.
The writer of Hebrews continually makes mention of the superiority of Christ in both His personage and in His ministering work. In the writings of the Old Testament, we understand the rituals and ceremonies of Judaism symbolically pointed to the coming of Messiah. In other words, the rites of Judaism were but shadows of things to come. Hebrews tells us that Christ Jesus is better than anything mere religion has to offer. All the pomp and circumstance of religion pales in comparison to the person, work, and ministry of Christ Jesus. It is the superiority of our Lord Jesus, then, that remains the theme of this eloquently written letter.