If you toss the trinity doctrine, then explain how a mere man, a created being, can pay an infinite penalty.

Christ’s death was said to pay an infinite penalty, after all. If he was deity, then he was infinite, and the penalty could logically be paid for in full, and he could cry ‘tetelestai,’ it is finished, paid in full.

Can this be true if anything other than God, tries to pay it? If so, you have the problem of explaining how a finite being paid an infinite penalty, right?