Okay, I watched most of the video in the link, and skimmed over the rest...
Emotional abuse in connection with religious beliefs certainly exists, but....well, those same basic explanations were given to me as a kid, and IMO that is pretty far from emotional abuse. I mean, unless the focus is in the wrong areas, and that all you're taught about is sin and how sinful you are--I mean, that's only half of the gospel. After all, God considers us all valuable enough to die for.
But the concept of us having a sin nature, and sin separating us from God (that leading to Jesus' death on the cross and resurrection), is simply a simplified way to explain the plan of salvation.
Now, I'm not familiar with that particular curriculum, and it does sound like they may possibly focus way too much on one point, completely missing the entire picture. Some of their lesson applications do sound kinda...extreme.