Any fellowship with the Roman Catholic Church and her daughters (Protestantism) will cause you to be deceived. See below for definition of Catholic and Ecumenical. They are one in the same.

Rev 18:4 ¶ And I heard another voice from heaven, saying, Come out of her, my people, that ye be not partakers of her sins, and that ye receive not of her plagues.
5 For her sins have reached unto heaven, and God hath remembered her iniquities.

cath·o·lic
adjective
including a wide variety of things; all-embracing.
“her tastes are pretty catholic”
synonyms: universal, diverse, diversified, wide, broad, broad-based, eclectic, liberal, latitudinarian;

ec·u·men·i·cal
adjective
adjective: ecumenical
representing a number of different Christian churches.
synonyms: nondenominational, universal, catholic, latitudinarian, all-embracing, all-inclusive
“the local churches are sponsoring an ecumenical service on the green”
antonyms: denominational
promoting or relating to unity among the world’s Christian churches.
“ecumenical dialogue”