All one needs to do is look at the pagan practices, vestments, and beliefs incorporated into the RCC to understand they teach the doctrines of demons.
PS Your argument is weak at its face. To say the Catholic Church is pagan because priests wear vestments is akin to saying the US military is a pagan organization because after all, the pagan Roman army wore uniforms too.
Gen. 14:18 Psalm 76:2 Psalm 110:4 Malachi 1:11 Exodus 12:14,17,24; cf. 24:8 Exodus 29:38-39 Lev. 19:22 Jer. 33:18 Zech. 9:15-16 2 Chron. 26:18 Gen. 22:9-13 Exodus 12:5 Exodus 12:7,22-23 Exodus 12:8,11 Exodus 12:43-45; Ezek. 44:9 Exodus 12:49 Exodus 12:47; Num. 9:12 Exodus 16:4-36; Neh 9:15 Exodus 24:9-11 Exodus 29:33 Lev. 7:15 Lev. 17:11,14 Gen. 9:4-5; Deut.12:16,23-24 2 Kings 4:43 2 Chron. 30:15-17; 35:1,6,11,13; Ezra 6:20-21; Ezek. 6:20-21 Neh. 9:15 Psalm 78:24-25; 105:40 Isaiah 53:7 Wis. 16:20 Sir. 24:21 Ezek. 2:8-10; 3:1-3 Zech. 12:10 Zech. 13:1