I think that we have to take the Biblical instruction to 'test the spirits' to heart in these kinds of situations.  I remember hearing David Icke when he first started to preach his ideas back in the early 1990s; I very quickly cottoned on to the fact that his was a mish-mash of old and new ideas, none of them particularly clever or realistic.  Here Martin and his 'message of love' actually comes into its own, because if the message that someone claims to have been given by God doesn't include this in some form or other - and many of these self-styled messiahs' messages don't - it is definitely NOT a message from the God who wants to reconcile humanity with himself.  That is not to say that it isn't a message from some god - many of the gods of this world are intent on destroying  - so in that sense I suppose we have to accept that they may be speaking on behalf of one or more such gods.