'Ignorant' in the Bible

For I do not want you to be unaware, believers, that our fathers were all under the cloud [in which God’s presence went before them] and they all passed [miraculously and safely] through the [Red] Sea;

Be sober-minded [be sensible, wake up from your spiritual stupor] as you ought, and stop sinning; for some [of you] have no knowledge of God [you are disgracefully ignorant of Him, and ignore His truths]. I say this to your shame.