According to the grace of God, which was given to me, as a wise master builder I have laid the foundation, and another builds on it. But let each one take heed how he builds on it. For no other foundation can anyone lay than that which is laid, which is Jesus Christ. Now if anyone builds on this foundation with gold, silver, precious stones, wood, hay, straw, each one’s work will become clear; for the Day will declare it, because it will be revealed by fire; and the fire will test each one’s work, of what sort it is.
1 Corinthians 3:10-13 NKJV
Nothing can be added to what Jesus Christ did. To mix anything man-made as a means of our Salvation is to insult God and sink all hopes of our eternal life with Him.