Hello MrPedantic and Aleen
It doesn't involve too much typing :-)
Quran speaking about freedom of belief :
Chapter 2 verse 256 There is no compulsion in religion. The right direction is henceforth distinct from error. And he who rejecteth false deities and believeth in Allah hath grasped a firm handhold which will never break. Allah is Hearer, Knower
109 : 6 Unto you your religion, and unto me my religion.
17 : 84 Say: Each one doth according to his rule of conduct, and thy Lord is Best Aware of him whose way is right.
18 : 29 And say: The truth is from your Lord, so let him who please believe, and let him who please disbelieve; surely We have prepared for the iniquitous a fire, the curtains of which shall encompass them about; and if they cry for water, they shall be given water like molten brass which will scald their faces; evil the drink and ill the resting-place.
Quran saying Allah will punish :
16 :106 Any one who, after accepting faith in Allah, utters Unbelief,- except under compulsion, his heart remaining firm in Faith - but such as open their breast to Unbelief, on them is Wrath from Allah, and theirs will be a dreadful Penalty
Hadith saying kill apostates :
Bukhari - Book of Jihad Volume 4, Book 52, Number 260
Narrated Ikrima: Ali burnt some people and this news reached Ibn 'Abbas, who said, "Had I been in his place I would not have burnt them, as the Prophet said, 'Don't punish (anybody) with Allah's Punishment.' No doubt, I would have killed them, for the Prophet said, 'If somebody (a Muslim) discards his religion, kill him.' "