Was King Agrippa truly persuaded by Paul's witness?
No, King Agrippa was not truly persuaded by Paul's witness. He said, "Almost Paul, you've persuaded me," but the context concludes he never actually believed. To be persuaded means to be totally convinced, and Agrippa's "almost" shows he stopped short of that total conviction.
Les teaches that Paul had witnessed to King Agrippa more than once in Acts. Agrippa replied, "Almost Paul, you've persuaded me." Les explains that being persuaded means being totally convinced, and he does not believe Agrippa ever truly was. The word "almost" indicates Agrippa stopped short of full conviction. This contrasts with Paul's own persuasion in verse 38, where Paul declares he is persuaded, and with the surrounding assurance that believers are more than conquerors through the One who loved them.
Then Agrippa said unto Paul, Almost thou persuadest me to be a Christian.