For those making that claim, my contention is that the best way to be “spiritual” is to understand where real spirituality is found.
4 As you come to him, the living Stone—rejected by humans but chosen by God and precious to him— 5 you also, like living stones, are being built into a spiritual house to be a holy priesthood, offering spiritual sacrifices acceptable to God through Jesus Christ. (1 Peter 2:4-5, NIV)
We may think we know “spiritual.” But we don’t know a thing until we know spiritual. 😉