Blasphemy against the Holy Ghost is a willful determine opposition towards the power and workings of the Holy Spirit. Talking against speaking in tongues is not blasphemy. Religion and denominations do not draw you to God. A relationship with God draws you to God. Hardening of heart is to be cold, insensitive , unfeeling, and unyielding. There has to be a changing of the heart before you can receive revelations. Link