Thank you PT, it just sounds logical, I was questionning the reality of this secret plot considering that muslims are indeed mostly killing each other in the south...

I think the secret plot complaint is a reaction to muslims being more visible in other parts of Thailand, but I can't see this phenomenon causing the decline of Buddhism in Thailand ... have to look at "Buddhists" to get the root cause (materialism in thai society... the various controversies about monks and temples practices didn't help)