The thief on the cross prayed a 'Sinner's Prayer' - he called upon the name of the Lord! He confessed Jesus as Lord in repentance and faith!
The so-called 'Sinner's Prayer' is simply the cry of the repentant sinner to Christ to save him as he confesses Jesus as Lord. It's Biblical, simple to do .... and the devil hates it! That's why he attacks it so much! What a LOSER!
And he said unto Jesus, Lord, remember me when thou comest into thy kingdom....
Evangelist Alex Bowler