As a liberal Catholic, I can speak to this is a few ways.
First, I believe that our Church is a pilgrim church that is constantly increasing our understanding of our faith. We have Tradition that comes to us from our long history and as Vatican II’s Dei Verbum states, tradition grows as we prayerfully consider our experiences and learning in consultation with the bishops and theologians.
Second, I believe that two truths cannot contradict one another, even of on first appearance they seem to do so. As such, I view the Church as the repository of God’s truth, but also feel that the scientific method is a reliable way to discover truths about our universe and bodies. The reconciliation of these two types of truth can be a sometimes painful process and cause us to have to give up our assumptions about how we would like the world to be. That pain flows both ways, if we are honest all around.