It is a major part of my faith because I have discovered that all of the doctrines of the New Testament are grounded in the first 11 chapters of Genesis, worship in the Book of the Revelation centers on God's creative act (Rev 4:11), God's counsel to Job, in the midst of his misery, was a question and answer session with 77 questions about creation (Job 38-42), and failure to hold to Biblical creation position was instrumental in the transformation of Marx, Lenin, Stalin, Templeton, and Welhausen, all of whom were raised in homes with one degree or another of Christian influence, but all of whom rejected Christ after reading Darwin's Origin of the Species. And, additionally, Jesus references the early chapters of Genesis repeatedly.
Please read Why the Church must emphasize Creation."
But, then again, that is just me. And, BTW, I am not casting any stones. I am just relating some of what I have discovered after much study. It is certainly up to each one of us to make up our own minds about what is important, and what is incidental.