UNFORGIVABLE SIN
Unbelief is the unforgivable sin. The reason why Jesus rebuked the Pharisees in regard to blasphemy they rendered to the Holy Spirit was because they did so in unbelief. They needed Jesus to authenticate the influence he was moving in and working under. So they mocked him by saying he was performing the miracles under the influence of baalzebub who was an idol god among the philistines. It provoked Him since comparing God, our Father (YHWH), with an idol is the greatest act of blasphemy especially when coming from a well educated class of the Jews in matters of law and their religion, they well were sure that baal could not at all do the miracles that Jesus did. The law is clear and was to them that you shall not place God in comparison with the idols (You shall not make for yourselves any graven images and you shall not worship them) {All paraphrased}.
So what is my point, just don't beat yourself up because of what you have said. As you grow in CHRIST you will be matured into perfection as your faith grows. Remember Jesus metaphorically used a mastered seed to teach us about faith. When a seed as such is placed on a ground that is conducive for its development it grows into a tree and growth is a process that begins from a tender position to a toughened one with a capacity to produce more fruit and seed. Take heart you have done no sin only keep on believing, read and study the scriptures with Christ in mind and you will be perfected in the grace that he gives.