I don't think its gonna sticks since they will either say its out of context or its not authentics, but I will post it again which prove it clearly.
Quran 4:89
They wish you would disbelieve as they disbelieved so you would be alike. So do not take from among them allies until they emigrate for the cause of Allah . But if they turn away,
then seize them and kill them wherever you find them and take not from among them any ally or helper.
Sahih Bukhari 6922
Some Zanadiqa (atheists) were brought to `Ali and he burnt them. The news of this event, reached Ibn `Abbas who said, "If I had been in his place, I would not have burnt them, as Allah's Messenger (ﷺ) forbade it, saying, 'Do not punish anybody with Allah's punishment (fire).' I would have killed them according to the statement of Allah's Messenger (ﷺ),
'Whoever changed his Islamic religion, then kill him.'
Sahih Bukhari 6923
Behold: There was a fettered man beside Abu Muisa. Mu`adh asked, "Who is this (man)?" Abu Muisa said, "He was a Jew and became a Muslim and then reverted back to Judaism." Then Abu Muisa requested Mu`adh to sit down but Mu`adh said,
"I will not sit down till he has been killed." This is the judgment of Allah and His Apostle (for such cases) and repeated it thrice.
Then Abu Musa ordered that the man be killed, and he was killed.
Sahih Bukhari 6930
"No doubt I heard Allah's Apostle saying, "During the last days there will appear some young foolish people who will say the best words but their faith will not go beyond their throats (i.e. they will have no faith) and will go out from (leave) their religion as an arrow goes out of the game. So,
where-ever you find them, kill them, for who-ever kills them shall have reward on the Day of Resurrection."
Sahih Muslim 4154
'Abdullah (b. Mas'ud) reported: Allah's Messenger (Peace be upon him) stood up and said: By Him besides Whom there is no god but He,
the blood of a Muslim who bears the testimony that there is no god but Allah, and I am His Messenger, may be lawfully shed only in case of three persons:
the one who abandons Islam, and deserts the community [Ahmad, one of the narrators, is doubtful whether the Holy Prophet (Peace be upon him) used the word li'l-jama'ah or al-jama'ah), and the married adulterer, and life for life.