I don't think they will be successful enough. This part of the world was ruled by the ex-colonial masters (Portugese, Dutch, Japan and British) for hundred of years but 99.9% Malays remain muslim until present day though they (especially the catholics) did sent all their top guns to entice the locals.
But I believe, small number will be lured into christianity because of money, women and aquas.
One thing we must tell these morons, by leaving Islam it will not in anyway harm Islam, Allah will remain Allah, God the Almighty forever. The one going to lose are these morons. Likewise, by reverting to Islam will not in anyway benefits Allah, the reverts are the one going to get the benefits.