So this is for adults? Are you looking for discussion points or activities?
One activity would be for pairs or small groups to answer these questions and then compare what groups come up with. This avoids "group think."
There are also some "heavy" words here that people may not know what they really mean (or have a limited understanding of). "Corruption" for example, "Divine nature." "Election." Be ready to define those (use a theological dictionary, such as Holman's.
For example, a lot of bad theology has been created from a misreading of 2 P 1:4. ..."participate in the divine nature." The word "participate" is actually the familiar and well-known word "koinonia" = "fellowship" "companion." It doesn't mean we "become" divine, it means we are in fellowship with the divine, -a tie that binds so to speak. But people often get that terribly wrong. "Corruption" is another misunderstood word concept. It means "death, misery."
3 His divine power has given us everything we need for a godly life through our knowledge of him who called us by his own glory and goodness.
WHAT is the "everything" that God has he given us? I'm sure many people don't feel like they have enough of whatever "everything" is.
4 Through these he has given us his very great and precious promises, so that through them you may participate in the divine nature, having escaped the corruption in the world caused by evil desires.
WHAT are those promises?
HOW do we "participate" in the divine nature? (and what is the "divine nature" he's talking about)?
Does anybody REALLY feel like they have "escaped corruption"? I'd be surprised if they did. So what does this really mean?
5 For this very reason, make every effort to add to your faith goodness; and to goodness, knowledge; 6 and to knowledge, self-control; and to self-control, perseverance; and to perseverance, godliness; 7 and to godliness, mutual affection; and to mutual affection, love.
This is a good "list" ...what other things have your people found helpful to keep from being "ineffective and unproductive."
8 For if you possess these qualities in increasing measure, they will keep you from being ineffective and unproductive in your knowledge of our Lord Jesus Christ. 9 But whoever does not have them is nearsighted and blind, forgetting that they have been cleansed from their past sins.
I would ask those in class who are "nearsighted" to explain to others what they think this means.
10 Therefore, my brothers and sisters, make every effort to confirm your calling and election. For if you do these things, you will never stumble, 11 and you will receive a rich welcome into the eternal kingdom of our Lord and Savior Jesus Christ.
Do we ever really "NEVER" STUMBLE"? Is that realistic? What is the writer driving at?