Pope Francis said on Wednesday he wanted to offer "spiritual and material" support on his first tour of Africa, where he will address a fast-growing Catholic congregation and seek to heal divisions between Christians and Muslims.<br />Millions of Christians - Catholics and others - are expected to turn out for public celebrations of Mass, presenting a challenge for national security forces to keep the pontiff and the huge crowds safe.<br />About 30 percent of Kenya's 45 million people are baptized Catholics, including President Uhuru Kenyatta.<br />He will address the faithful in a public Mass at Nairobi University on Thursday - declared a national holiday - and is expected to seek to heal ethnic rifts that have long plagued Kenya.
