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Qur'an (4:89) - "They wish that you should disbelieve as they disbelieve, and then you would be equal; therefore take not to yourselves friends of them, until they emigrate in the way of God; then, if they turn their backs, take them, and slay them wherever you find them; take not to yourselves any one of them as friend or helper."
Qur'an (9:11-12) - "But if they repent and establish worship and pay the poor-due, then are they your brethren in religion. We detail Our revelations for a people who have knowledge. And if they break their pledges after their treaty (hath been made with you) and assail your religion, then fight the heads of disbelief - Lo! they have no binding oaths - in order that they may desist."
Bukhari (52:260) - "...The Prophet said, 'If somebody (a Muslim) discards his religion, kill him.' "
Bukhari (83:37) - "Allah's Apostle never killed anyone except in one of the following three situations: (1) A person who killed somebody unjustly, was killed (in Qisas,) (2) a married person who committed illegal sexual intercourse and (3) a man who fought against Allah and His Apostle and deserted Islam and became an apostate."
the Q'uran (5:33) - "The recompense for those who wage war against God and his Messenger, and strive with might and main for mischief through the land is: execution, or crucifixion, or the cutting off of hands and feet from opposite sides, or exile from the land. That is their disgrace in this world, and for them in the hereafter is a severe punishment. "(5:33)
Leaving Islam is tantamount to rejection of Allah.....
Muhammad said: "Whoever changed his Islamic religion, then kill him" (Bukhari 9.84.57).
[3.85] And whoever desires a religion other than Islam, it shall not be accepted from him, and in the hereafter he shall be one of the losers.
[3.86] How shall Allah guide a people who disbelieved after their believing and (after) they had borne witness that the Apostle was true and clear arguments had come to them; and Allah does not guide the unjust people.
[3.87] (As for) these, their reward is that upon them is the curse of Allah and the angels and of men, all together.
[3.88] Abiding in it; their chastisement shall not be lightened nor shall they be respited.
[3.89] Except those who repent after that and amend, then surely Allah is Forgiving, Merciful.
[3.90] Surely, those who disbelieve after their believing, then increase in unbelief, their repentance shall not be accepted, and these are they that go astray.
[3.91] Surely, those who disbelieve and die while they are unbelievers, the earth full of gold shall not be accepted from one of them, though he should offer to ransom himself with it, these it is who shall have a painful chastisement, and they shall have no helpers.