Greater Manchester is home to a diverse population and is a multicultural agglomeration with an ethnic minority population comprising 8.5% of the total population in 2001. In 2008, there were over 66 refugee nationalities in the county. At the 2001 UK census, 74.2% of Greater Manchesters residents were Christian, 5.0% Muslim, 0.9% Jewish, 0.7% Hindu, 0.2% Buddhist, and 0.1% Sikh. 11.4% had no religion, 0.2% had an alternative religion and 7.4% did not state their religion. This is similar to the rest of the country, although the proportions of Muslims and Jews are nearly twice the national average. It contains the Heaton Park Hebrew Congregation, a large Ashkenazi Orthodox synagogue in North Manchester. Greater Manchester is covered by the Roman Catholic Dioceses of Roman Catholic Diocese of Salford and Roman Catholic Diocese of Shrewsbury, and the Roman Catholic Archdiocese of Liverpool. Most of Greater Manchester is part of the Anglican Diocese of Manchester, apart from Metropolitan Borough of Wigan which lies within the Anglican Diocese of Liverpool.
Question: How many dioseces are in Manchester?
Answer: 4