That's a very important point (Hebrews 11:6) which you mentioned in this video!

About the typical argument from the thief that is hang on the cross I've to say, this man started to repent shortly before he died, so he has got no chance for baptism in water contrary to a human who has this chance and decide not to obey the Lord Jesus Christ.

Jesus criticized people who're not willing to obey in "Luke 6:46-47", so that's also applicable by people who decide to deny baptism although they have the chance for this.