I disagree that punishment for being an apostate and infidel is not spelled out in the Quran.
From FaithFreedom.org:
Look up the verses yourselves. Some of these quotes, selected from a great many on the source site, seem to stop short of actually saying "Kill anyone who is of a different faith than you", while others are rather overt.
From FaithFreedom.org:
Quote:/snip
3:90-91 "Verily, those who disbelieved after their Belief and then went on increasing in their disbelief - never will their repentance be accepted [because they repent only by their tongues and not from their hearts]. And they are those who are astray. Verily, those who disbelieved, and died while they were disbelievers, the (whole) earth full of gold will not be accepted from anyone of them even if they offered it as a ransom. For them is a painful torment and they will have no helpers."
4:89 They long that ye should disbelieve even as they disbelieve, that ye may be upon a level (with them). So choose not friends from them till they forsake their homes in the way of Allah; if they turn back (to enmity) then take them and kill them wherever ye find them, and choose no friend nor helper from among them,”
9:66, Make ye no excuses: ye have rejected Faith after ye had accepted it. If We pardon some of you, We will punish others amongst you, for that they are in sin
9:74, They swear by Allah that they said nothing (evil), but indeed they uttered blasphemy, and they did it after accepting Islam; and they meditated a plot which they were unable to carry out: this revenge of theirs was (their) only return for the bounty with which Allah and His Messenger had enriched them! If they repent, it will be best for them; but if they turn back (to their evil ways), Allah will punish them with a grievous penalty in this life and in the Hereafter: They shall have none on earth to protect or help them.
/snip
Unbelievers
2:191, And slay them wherever ye catch them
2:193, And fight them on until there is no more Tumult or oppression
2:216, Fighting is prescribed for you, and ye dislike it. But it is possible that ye dislike a thing which is good for you
3:28, Let not the believers Take for friends or helpers Unbelievers rather than believers: if any do that, in nothing will there be help from Allah
4:48 “Allah forgiveth not that partners should be set up with Him; but He forgiveth anything else, to whom He pleaseth; to set up partners with Allah is to devise a sin Most heinous indeed.”
4:84, Then fight in Allah’s cause - Thou art held responsible only for thyself - and rouse the believers. It may be that Allah will restrain the fury of the Unbelievers; for Allah is the strongest in might and in punishment.
/snip
Look up the verses yourselves. Some of these quotes, selected from a great many on the source site, seem to stop short of actually saying "Kill anyone who is of a different faith than you", while others are rather overt.