That passage doesn't exactly promote POV very well as it is pointing out that the Gospel was being corrupted before the Apostles were gone. After the Apostles were gone, well that is what classical christianity is today, the very false gospel Paul was warning the Galatians about. The same warning is found in other epistles.
Verse 8 also does not promote your POV either.
But though we, or an angel from heaven, preach any other gospel unto you than that which we have preached unto you, let him be accursed.
If Paul is warning about the preaching of false apostles and angels, that implies the acceptance of divinely appointed apostles and angels preaching the true gospel message.
Paul CLEARLY said ANGEL, and the Mormon relkigion is based upon the revelation of a NEW GOSPEL brought by an ANGEL
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