求翻译：罗马天主教的教会组织是美国最大的，也比较统一，约有5000万教徒，这些教徒主要是爱尔兰人、意大利人和波兰人的后裔，他们主要集中在美国东部大城市。占全国人口的24%。是什么意思？

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Roman Catholicism's church organization is US biggest, also quite is unified, some 50,000,000 believers, these believers mainly are approximately the irish person, the Italian and Pole's descendant, they mainly concentrate east US the big city.Accounts for the national population 24%.

Roman Catholic church organization is the United States largest and also more uniform, about 50 million followers, the mainly Protestant Ireland people, Italy and Poland man's seed, they are mainly concentrated in the United States East of big cities. 24% per cent of the population.

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