God's questions were not to obtain information but to encourage Adam and Eve to confess their sin. Instead of repentance, however, they responded by feeble attempts at self-justification, each blaming someone else. In this, they behaved like most of their descendants.

Source:

KJV Defenders Study Bible, by Dr. Henry Morris, Ph.D.
Publisher: Thomas Nelson
Language: English
DEF 10 ISBN 0-529-10444-x
DEF 10-1 ISBN 0-529-10445-8