It's not unusual for people not to understand the parallelism of faith and obedience, but it is a problem that causes other problems for properly understanding the Bible. It's part of the reason behind some of these arguments re: faith and works. We can compare these verses with Heb5:9:
16 But they have not all
obeyed the gospel. For Isaiah says, “Lord, who has
believed our report?”
The New King James Version (Nashville: Thomas Nelson, 1982), Ro 10:16.
8 in flaming fire taking vengeance on those who do not know God, and on those who do not
obey the gospel of our Lord Jesus Christ.
The New King James Version (Nashville: Thomas Nelson, 1982), 2 Th 1:8.
17 For the time has come for judgment to begin at the house of God; and if it begins with us first, what will be the end of those who do not
obey the gospel of God?
The New King James Version (Nashville: Thomas Nelson, 1982), 1 Pe 4:17.