No, I just don’t credit them with something they are not. That is not judgmental that is being factually correct. If you go out and claim to be a lawyer but you cannot produce that law degree and bar exam result then you were not and can be prosecuted under law. That is not being judgmental that is just being identified for what you are or are not. If you do not fill the requirements for being a Christian then you are not one no matter what you claim.
If they want to be known as a Christian they need to renounce the Book of Mormon and the Mormon belief in salvation and the Godhead and accept Christ as the only way to everlasting life period.