What does Ephesians 1:5 say God predestinated us to?

Les explains that Ephesians 1:5 says we were predestinated unto the adoption of children by Jesus Christ to Himself, according to the good pleasure of His will. He defines adoption as Paul uses it and as practiced in Roman and Greek culture: a child was put under tutors, educated, trained, and prepared to come in at an equal level with the father, and then went through the rites of adoption. The Hebrew culture has something akin to this in Bar Mitzvah when a boy reached age 14, but it was not the same category because Romans and Greeks were in the secular world, preparing the child to be a co-worker in the business. Paul teaches that the moment we become a believer, we do not go through years of tutoring and training; we are immediately placed as an heir with the Father and the Son. Thus, Les says, we were predestinated not to heaven, not to hell, but as a believer to this position with Christ from day one, as a joint heir in the process of the adoption. He later connects this to Ephesians 1:11, that we have obtained an inheritance and are joint heirs with Christ; if you are a joint heir, the other parties are yours, and in the secular economy, if the other half passes off the scene, the heir ends up with it.