No, it's not a vague question. You brought up the first vision and what God told Joseph Smith. I'm asking you the same question. Do you feel that all Churches are created equal and provide "one Lord, one faith and one baptism? Are they all preaching the same gospel of Jesus Christ?
"The Spirit clearly says that in later times SOME will abandon the faith and follow deceiving spirits and things taught by demons." (1 Tim. 4:1)
We would agree on apostasy if we were both in unity with the Holy Spirit. Apostasy is prophesied by the Holy Spirit through Paul. Only it's partial apostasy: "SOME will abandon the faith." (You're not calling the Holy Spirit a liar are you? Especially when He could have just as easily said "all" or "total"?
"Jesus answered: 'Watch out that no one deceives you. For many will come in my name, claiming, 'I am the Christ, and will deceive many.'" (Matt 24:4-5)
Slapping "Jesus Christ" on to a building doesn't necessarily make it sourced in Him, as both Matt 24 and the LDS church both show. I believe it was Fast Coyote who said this week: Creating a new group called, "Democrats of the United States and Jesus Christ" doesn't mean that the Democrats are "out" as the viable party and the new restoration group is "in."