"Many such Christians know the Scriptures - sometimes well - but do not quote such in arguments or discussions with non-Christians, nor do they try to tell non-Christians what they should do with regard to personal beliefs."
This has got to be sarcasm. Right?
It does not say "all" - it says "many". If you are capable of understanding the difference, you may be able to fathom the absence of sarcasm. If you are bent on sarcasm, it can be yours.