Various governmental entities have established systems for legal use that can precisely specify kinships with common ancestors existing any number of generations in the past, though common usage often eliminates the degrees and removals and refers to people with common ancestry as simply "distant cousins" or "relatives".The number of "G" words used to describe this ancestor will determine how close the relationship is.
In the general sense, cousins are two or more generations away from any common ancestor, thus distinguishing a cousin from an ancestor, descendant, sibling, aunt, uncle, niece, or nephew.
Perhaps Christianity was the faith of one's parent or grandparent, and although the individual does not particularly follow the faith, they were ingrained from childhood that God is the ultimate authority, and the Bible is God's instruction book to mankind.
Whether one truly believes in the Bible or not, it seems to have become a social standard to attribute one's own assumptions of right from wrong on scripture.
The chart shown above makes distinguishing relationships quite simple providing the user is able to trace back to the common ancestor.
Finding the common ancestor is of critical importance, and yet is frequently overlooked.