Like I said, either use reliable file deletion software, or delete the offending material, empty the recycle bin, transfer several GB of innocuous files to your computer to overwrite any empty sectors, defragment, delete the extra files from your computer, defragment again, transfer the several GB of files back to your computer, delete them again, etc. Eventually the data will get overwritten.
Christian apologetics is the art of rolling a dog turd in sugar and selling it as a donut.
