LONDON — The British public want politicians to steer clear of religion just as key Westminster figures amp up debates on Christianity’s role in the country, new polling shows. A survey for POLITICO by independent London-based polling company Public First found 65 percent of voters back a separation between Christianity and politics — a view held by a clear majority of supporters of all the main political parties. The findings come as Prime Minister Keir Starmer’s challengers on the populist