So you have read one person’s perspective and you don’t agree with Francis Collins’ take on everything. Neither do I.
There have been contributors to BioLogos from a whole spectrum of theological persuasions. They often disagree with one another on different theological points, as one would expect people from a variety of denominations to disagree. It is a dialogue. Often differing perspectives are presented in the same blog series. You can’t possibly agree with everything BioLogos posts, because people are in dialogue and are often offering mutually exclusive explanations.
The fact is some of our contributors definitely have “non-liberal” biblical views of original sin. John Walton of Wheaton and Tim Keller of the PCA come to mind.