Modern Christianity is based on the notion of a universal outreach to the nations, begun in the First Century. However, a closer examination of the scriptures suggests that biblical concepts have been misunderstood and misapplied. Here are three:
1) The "world" into which Jesus was sent was Israel. The "world" is John's name for Israel. This would explain the seeming contradiction between Jesus’ statement that he was ‘sent only to the lost sheep of the house of Israel’ and John’s statement that Jesus was ‘sent to save the world’ rather than to 'condemn' it.
2) The "nations" to which the Apostles were sent were Israelites among non-Israelites. This explains the Apostle Paul's synagogue circuit in the Acts of Apostles. Those Israelites were 'the uncircumcised' to which Paul confined his outreach. His mission was to announce something new (i.e. 'good news' that the Messiah had appeared) so that they could become beneficiaries of the Abrahamic covenant.
3) The "Jew/Gentile" dichotomy is a misreading of Judean and nations. Judeans were those who practiced the customs of Judea; "Nations" and "Greeks" were Israelites living outside of Judea who largely practiced the customs of Hellenists.
If the above assertions are correct then no current version of Christianity is true. All versions are but flawed attempts to replicate the worship and worldview of Judaism's closing chapter. This would explain why Hebrew terms and concepts characterize "Christian" religions--especially those more zealously steeped in the study of the scriptures.
I welcome discussion of the above.
Reference:
Social-Science Commentary on the Letters of Paul. Malina, Bruce J. and Pilch, John J. (2006). Fortress Press