I recall a specific sermon given by AW Tozer. He was discussing biblical teaching on the doctrine of Separation. Which is a doctrine based on God’s command to be separate from sin and from sinful practices.
He was making a distinction between what the Bible teaches versus how Separation is commonly applied (or not applied) by Christians.
Because, we often take for granted the vast differences between popular Christian practice versus what the Bible actually commands us to do.
Unfortunately, most Evangelicals have no idea what Separation even is; let alone, how to properly apply it in their lives.