Firstly, some definitions:
“Secular”: without overt religious affiliation
“Sacred”: with overt religious affiliation
While “Secular” and “Sacred” are opposites (antonyms), there often exists a grey area between “secular” and “sacred”, e.g. a Christian doing secular work.
“Holy”: consistent with God’s standards
“Sinful”: going against God’s standards
What I’d like us all to better understand:
Just because something is sacred (being spoken or done by someone explicitly declaring that he is doing it in God’s name), doesn’t automatically make it holy.
E.g. “Christian” false teachers (sacred but sinful)
Likewise, something that is secular isn’t automatically sinful.
E.g. Scientific knowledge gained via secular means. (The world is God’s creation, so scientific knowledge about the world, is not automatically sinful.)
A problem I have observed is that many Christians tend to be unjustifiably allergic to secular (scientific) material, while conversely being unjustifiably accepting of sacred material. (E.g. refusing to follow basic “secular” advice like regular exercise and nutrition, yet unquestioningly accepting pious-sounding drivel continually churned out by various “Christian” teachers / organisations.) Which can be very ironic, because the bible itself speaks clearly of how “even Satan disguises himself as an angel of light”:
2 Corinthians 11:12-15 (CEB)
12 But I’m going to continue to do what I’m doing. I want to contradict the claims of the people who want to be treated like they are the same as us because of what they brag about. 13 Such people are false apostles and dishonest workers who disguise themselves as apostles of Christ. 14 And no wonder! Even Satan disguises himself as an angel of light. 15 It is no great surprise then that his servants also disguise themselves as servants of righteousness. Their end will be what their actions deserve.
It’s tragic how Christians, in their pride / arrogance, fancy themselves as being too good to succumb to false teaching, and so act as though anything that superficially sounds good to them is true (even though it’s just some pious-sounding words expressing ideas not even found explicitly in the bible, and could easily be coming from Satan instead of God).