These terms have multiple meanings. However, here are "normative" answers.

Religious Pluralism typically is the belief that all religions are essentially "true" or at least valid. This is in contrast with Religious Exclusivism which believes that one religion is correct and the rest are wrong/invalid, and Religious Inclusivism where more than one may be true/valid... but not necessarily all of them. John Hick is probably the best known of the Religious Pluralists.

Interfaith Dialogue has to do with intentional discussion between different faiths/religions with the purpose of great mutual understanding. This is in contrast with Interfaith Apologetics (dialogue) or Polemics (monologue), where the purpose is to convert.

It is thought by some (John Hick, for example) that one must be a religious pluralist (relativizing one's own beliefs) to be effective at interfaith dialogue. However, others, such as Martin Buber, would argue that pluralism is not a requirement... just mutual respect.

Doctrinal conformity simply means that an individual or group's doctrinal/theological/religious beliefs and/or teachings are in substantial harmony with the broader community/tradition of which they claim to be a part.

For instance, to be in doctrinal conformity with Christians, one must affirm the Triunity of God (Father, Son, and Holy Spirit - one God in three persons), the deity of Christ as well as his manhood (fully God and fully man), the atonement Christ made on the Cross, miracles, the inspiration and infallibility of the Bible, the second coming of Christ in judgment, the bodily resurrection of Christ and of believers, etc.

The Nicene Creed, for instance, is a summary of Christian doctrine that all genuine Christians affirm. One can thus identify a cult by its lack of affirmation or conformity with such Biblical, Christian doctrines (e.g. Mormonism, Jehovah's Witnesses, United Pentecostals).

Substantial doctrinal conformity in the truth of God is what Christian churches ought to expect of their members over against doctrinal inclusivism and relativism that seeks to bind people together in a lie.