While playing secular music might be fun for the flesh and splicing that music into sacred music might seem like a good idea, it treads on dangerous territory of causing your brother or sister to fall. Read the words of Paul to the church at Corinth below:
(8) It’s true that we can’t win God’s approval by what we eat. We don’t lose anything if we don’t eat it, and we don’t gain anything if we do. (9) But you must be careful so that your freedom does not cause others with a weaker conscience to stumble. (10) For if others see you—with your “superior knowledge”—eating in the temple of an idol, won’t they be encouraged to violate their conscience by eating food that has been offered to an idol? (11) So because of your superior knowledge, a weak believer for whom Christ died will be destroyed.
-1 Corinthians 8:8-11
So at what point does a superior “musical” knowledge take a back seat to having a heart for the very people Jesus Christ died for? Although it may seem insignificant, splicing secular music into sacred music could, at most, cause your brother or sister to stumble OR, at least, cause your brother or sister to see the church no differently than they see the world (a stumbling block in and of itself). As Christians, we should not do that. In fact, in the same chapter of Corinthians, Paul goes on to write:
So if what I eat causes another believer to sin, I will never eat meat again as long as I live—for I don’t want to cause another believer to stumble.
-1 Corinthians 8:13 (NLT)
If Paul took it that seriously about eating meat, then shouldn’t we, as Christian musicians, take it that seriously with the music we play for God? Moreso than that, I submit to you that God has given us too much creativity to have to copy and paste a secular song onto a sacred song. I honestly believe that the more you seek God, the more He reveals new and fresh music to you. Music so new and fresh that it’s never been heard on Earth before. Want to know how I know?
He has given me a new song to sing, a hymn of praise to our God. Many will see what He has done and be amazed. They will put their trust in the Lord.
-Psalms 40:3 (NLT)