Here are some resources and helps that we have mentioned on Sunday Nights.
Some Helpful videos from a Christian Scholar (He is Lutheran and says a few things that will sound different)
Islam’s View of Sin and Salvation
Handout from Sunday Night’s Studies
https://www.youtube.com/watch?v=P4V3O2hGCeA
https://www.youtube.com/watch?v=4XUub1no1qw