There is simply no hint anywhere in the Bible that God used an evolutionary process to create the universe or life, nor is there any hint of long ages in the Bible.
Acceptance of such evolutionary/old-Earth claims logically undermines the authority of Scripture, and ultimately the authority of the Lord Jesus Himself.
In essence, Bio Logos argues that Christians should accept essentially the origins claims made by secular scientists and attempt to somehow incorporate those ideas into the Christian faith.
However, this is simply not possible if one takes the Bible's claims seriously.
The Bio Logos Foundation is an organization that promotes what it calls "evolutionary creation."It goes further than other old-Earth "Christianity and science" organizations (such as Reasons to Believe) in that it urges Christians to accept, not just the doctrine of an old Earth, but the doctrine of evolution itself.