No middle ground position. No neutrality.
If the LDS are right--that what a mid-teen saw and heard as a 14 or 16 yo--then every church is an apostate church and every church member is an infidel (every church save the LDS church).
If what Joe Smith heard is correct: That we are to "join none of them" (other churches); "for they were ALL wrong...[AND] ALL their creeds were an abomination in his [Personage that appeared to him] sight; that those professors were ALL corrupt..." then the Baptists, Eastern Orthodox, Presbyterians, Catholics, Methodists, Lutherans, Wesleyans, charismatics, Assemblies of God, etc. have no business being in business of the gospel.
This is not merely a "dark corner" position of the LDS church. What is quoted above is LDS scripture--the Pearl of Great Price, Joseph Smith - History, verse 19. This is mainstream and foundational LDS doctrine. The LDS as a church can only stand with the 100% default of every other church.
Don't forget, after this all-or-nothing pronouncement by God, Smith decided to attend a Methodist church. Not to mention his mother, at the time, was attending a Presbyterian church. If your own mother will not believe in your new faith system, then there must be something wrong.