What does Ezra 4:2 mean?

they came to Zerubbabel and the family leaders and said, 'Let us help you build, because we worship your God too and have been offering sacrifices to him since the days of Esarhaddon, king of Assyria, who brought us here.' Ezra 4:2 - Modern Text Bible

(These neighbors offered to help, claiming they worshiped the same God and had a history of making sacrifices to him.)