There are several points to be made about the wealth of the churches. One is that much of the 'wealth' is tied up in buildings, many of which are historic, iconic landmarks, expensive to run and a nightmare to repair and in salaries and pensions, training, mounting major public events and so on. Another is that of course, a church doesn't need any of that. But members of a faith community want the place where they worship to be as beautiful as possible. Look what happened with the people who arrived from Asia in the 20th century. They started off worshipping in community halls and rented houses and as soon as they could, built temples, mosques, gurdwaras. Much of the wealth of all religions is from the gifts of the faithful, willingly given.