Does a Muslim's desire for a popular saying among the wicked, along with his joy in it, without uttering it, constitute apostasy from Islam, given that it clashes with Sharia or is considered an affirmation of falsehood and a denial of Sharia?

What you mentioned does not necessitate a ruling of disbelief; rather, it is merely whisperings that disturb one's tranquility, and bring about confusion and sadness. The Messenger of Allah, peace and blessings be upon him, said: "Indeed, Allah has forgiven my nation for what their souls whisper or speak to them, as long as they do not act upon it or speak of it." The servant's dislike, fear, and aversion to these devilish thoughts and whisperings are a sign of sound belief and strong faith. It requires turning away from such thoughts and whisperings, and refraining from those ideas.