Acceptable Religious Criteria
The Central Source, Creator, and Focus of All Existence, otherewise known as God,
must be recognized in all of God's incomprehensibleness
Challenges involved with acceptance of religions by the diverse community
Validity
The validity of a religion can be determined by the ability of its systematic beliefs to bring stability, commonality, completeness, and unity to its followers by a universal central focus. Many efforts and organizations cross over into religion, intentionally or not, but are none-the-less considered religiously valid.
Merriam-Webster's Collegiate Dictionary
Religion
1b(2) : commitment or devotion to religious faith or observance
2 : a personal set or institutionalized system of religious attitudes, beliefs, and practices
Religious
1 : relating to or manifesting faithful devotion to an acknowledged ultimate reality or deity
<a religious person> <religious attitudes>
Acceptability
The intentions and effects a religion has on humanity can determine its acceptability. In most situations, religious beliefs must be viewed separately from the cultures they are associated with in order to determine the purpose and effects on societies and individuals. It's sometimes difficult to evaluate productive from counterproductive religious beliefs because they not only affect physical matters, but un-measurable invisible, spiritual, and emotional matters as well.
For purposes of Unidiversal Faith, acceptable religions are limited to those that can be genuinely singled out to promote stability, commonality, and inclusiveness of all humanity and the search for shared values and a positive, central focus among all humankind. If the Central Source, Creator, and Focus of all existence otherewise known as God is not recognized in all of His incomprehensibleness, as in the case of Jesus Christ's ability to reconcile all to God, then the religion is shallow but retrievable.
Please note that accepting basic beliefs of a religion does not mean that the religion is Unidiversal because most religions are originated on pure, Unidiversal beliefs but it is very easy to reduce those beliefs to non-Unidiversal purposes.