How about looking at JC rather than God? God can be unforgiving -i.e. vengeance is mine, I shall repay saith the Lord etc, and God can be seen in both OT and NT as unforgiving.
Make it dynamic - involve the kids.
So,
Starter: personal reflective activity - think about a time when you have let someone down, done or said something you regretted. How did you feel? What did you do in order to feel better?
Be prepared to share your thoughts with the whole class. Short discussion (you will hopefully get the idea of forgiveness/atonement out of this)
Main activity
Put laminated sheets with quotes from JC about forgiveness round the room. Give each student a worksheet.
In groups of two or three ask them to look at the quotes and answer the key question on each quote. Complete worksheet.
After the students have looked at all the quotes they have to come to a consensus in their groups about how each question should be answered.
Class discussion on the answer to each question.
Plenary
In groups either, draw a poster to show what they have learned from JC's teachings on forgiveness. Share with other groups.
or
Body sculpture to explain what they have learned.
I have this and the resources on my PC, and a follow up lesson as well looking at forgiveness in action, but you'd need the Test of Time video and teaching pack for that
.
If you want the lesson plan and resources email me [email protected] and I'll ping them off to you.
If they are less able, then having them move around and discuss helps. Some of my best lessons have been discussions with those at the lower end. I used to give them handouts, and then we would talk about the issues, and they had the notes for when they needed to revise.