Syncretism is the combining of different beliefs, while blending practices of various schools of thought. It opposes the TRUTH that:

Colossians 1-2

1:24 His body, which is the church,

1:25 preaching the word of God, 26 that is, the mystery

1:27 the mystery , which is Christ in you, the hope of glory.

1: 28 We proclaim Him,

1: 29 For this purpose also I labour

2:6 Therefore as you have received Christ Jesus the Lord, so walk in Him, 7 having been firmly rooted and now built up in Him and established in your faith, just as you were instructed, and overflowing with gratitude.