Plenty of people believe plenty of religious texts.
In terms of Christianity, to conflate natural disasters and gay marriage is at the same end of the spectrum as assorted tele evangelists of the nuttier variety, and not that distant from the inbred loons at Westbro.
However, there's nothing in what he wrote that constitutes incitement, and he is entitled to his opinion, regardless of how barking it is.
One of the funnier things is UKIP's u-turn from defending his right to hold and voice an opinion on Saturday, to changing its tune 24 hours later. The embarrassment factor rather overtook the party's commitment to free speech.