He knows the law. He's entitled to express his religious views. He just about steers clear of urging people to kill and just keeps the right side of the line on laws against racial hatred. The latter is pretty close though: the Public Order Act s18, provides that , otherwise than inside a dwelling when the words are not heard outside it, a person who uses threatening, abusive or insulting words or behaviour and who intends to stir up racial hatred or is likely to stir up racial hatred thereby, is guilty of an offence. It depends whether his words are 'threatening, abusive or insulting'. He must think they are not; he may be right, on a strict view.