We all know Jesus could and does forgive sinners, as He delegated that power to the Apostles (Mat18:18). He certainly could have forgiven the man on the cross next to Him.
I bet the poor sinner was never baptized either, but all of these things are management decisions, and we are just in sales.
Here is the context of Romans 10:9. Others have said it better, so here it is:
“Thou shalt be saved. To confess the Lord Jesus, and to call upon the name of the Lord, (ver. 13.) is not barely the professing of a belief in the person of Christ: but moreover implies a belief of his whole doctrine, and an obedience to his law; without which the calling of him Lord will save no man. (St. Matthew vii. 21.) (Challoner) -— This passage must be understood like many others of this apostle, of a faith accompanied by a good-will ready to perform what faith says must be practised; as it is required in this very place, that what we believe in the heart, we should confess with our mouth. (Estius)”
Also, demons know that Jesus is Lord and God raised Him from the dead. They have said so. In fact, Jesus commanded them NOT to reveal His divine nature. So, proof texting doesn’t work.
One person's opinion...That's all...And it's wrong...