Acts17apologetics should give it a try; leave Islam and come back?

In answer to the video "Muhammad: The Suicidal Messenger (David Wood)"

Anyone can leave Islam and come back time and time again without punishement or being killed 4:137 which bellies the idea of killing a person as a punishement for leaving Islam or wavering in his faith. However God will only accept his repentence if it is sincere 3:86-89 and not followed by constant periods of disbelief then belief 4:137. 

As reported by ibn Abbas 

"A man from among the Ansar accepted Islam, then he apostatized and went back to Shirk. Then he regretted that, and sent word to his people (saying): 'Ask the Messenger of Allah [SAW], is there any repentance for me?' His people came to the Messenger of Allah [SAW] and said: 'So and so regrets (what he did), and he has told us to ask you if there is any repentance for him?' Then the Verses: 'How shall Allah guide a people who disbelieved after their Belief up to His saying: Verily, Allah is Oft-Forgiving, Most Merciful' was revealed. So he sent word to him, and he accepted Islam."

Nowhere does the Quran say a person must be punished or killed solely for the act of apostasy and all it mentions is that apostates shall face a terrible punishment in the Hereafter. This of course excludes those who apostize unwillingly, who are

3:86-91,16:106"compelled while his heart is at rest on account of faith".

Such a person is compelled to renounce faith with his lips due to imminent danger on his life while he remains a firm believer in his heart. This is what is often referred to as taqiya. The Quran doesnt condone lying, rather commands to uphold one's pledges, to judge with equity, to speak justly, kindly, with integrity, without corruption, with the outward locution corresponding to the intent 

4:5-9,135,6:152,2:83,235,3:32,70"O you who believe! Reverence God and speak justly". 

It is further to be noted here, that although martyrdom in the cause of faith is highly meritorious, still the Quran absolves those who sincerely, not out of lack of faith, cannot go to such an extent because

2:233"no soul shall have imposed upon it a duty but to the extent of its capacity". 

Saving life takes precedence over following the law. That is why a Muslim may eat pork if facing starvation. Exactly what Jesus taught in the Gospels when he transgressed the sabbath by citing David's example.

Punishment in the hereafter for the sin of apostasy is therefore solely the lot of the one who willingly, without any compulsion renounces Faith and:

"opens (his) breast to disbelief-- on these is the wrath of Allah, and they shall have a grievous chastisement".

Severing of social ties must be made with apostates who were former hypocrites, especially in the context of war as in the verses that will be quoted, since these former Muslims used to hide their hatred and enmity from other Muslims, and now openly declare it, even striving to make them leave their religion

4:88-89"What is the matter with you, then, that you have become two parties about the hypocrites, while Allah has made them return (to unbelief) for what they have earned?..They desire that you should disbelieve as they have disbelieved, so that you might be (all) alike".

They are therefore to be cut off from the community to avoid the spread of their mischief

4:89"take not from among them friends until they fly (their homes)/hajiru in Allah's way".

Ties with them can only be restaured when they decisively return to Islam (as indicated by the clause "fi sabilillah/for Allah's sake") and prove their faith to the rest of the community through difficult sacrifices such as leaving their homes and doing hijra in Allah's way, forsaking the domain of evil for an environement where they can practice their faith without restrictions, as the true believers were doing. If they do not do so then their expression of Islam is only for the purpose of spying and destruction, serving the purpose of those with whom Muslims are at war. In this case

4:89"if they turn back, then seize them and kill them wherever you find them, and take not from among them a friend or a helper".

They must be executed because of their open and secret hostile activities. However if those apostates refuse to flee their homes in Allah's way but nevertheless end the threat from within the community, by migrating for

4:90"a people between whom and you there is an alliance"

or who decide to remain within the Muslim community but have decisively abandonned all hostilities

4:90"who come to you, their hearts shrinking from fighting you or fighting their own people..withdraw from you and do not fight you and offer you peace, then Allah has not given you a way against them".

This Quranic passage establishes the social ruling as regards apostasy. The Quran frames it exclusively in the context of war, which is also the historical context in which the early scholars of Islam discussed the law of apostasy. That is why neither the Quran nor the scholars impose a punishement solely for the act of apostasy, but when it is coupled with hostile activity, verbal or physical.

Ridda is the word used in reference to those who engage in this multifaceted behavior. This historical perspective is often missed, disregarded or obscured whenever critics quote a saying from the prophet on apostasy, or the rulings of the fuqaha'. One can now understand the words of the prophet 

"The one who leaves his religion AND SEPERATES from the community, kill him". 

Here, the apostate is to be killed if he in addition severes all ties with the community. In those days, this amounted to joining enemy ranks. If the apostate remains in the community he is left unharmed. We thus see the prophetic practice in clear congruence with the aforementionned Quranic passage.

However even in times of peace, execution of an apostate is sometimes justified. In an Islamic state, Islam itself is what constitutes and legislates life on every level; administrative, economic, social etc. For a Muslim citizen to abandon Islam means to reject the law of the land. One cannot at the same time pledge to abide by those rules while rejecting the essence of the legislative authority, which is the Quran and the prophetic sunna. The entire system derives from these 2 pillars, and new laws are continuously formulated based on them. This constitutes a destabilising factor on all levels of society; how can a government endure if people reject a system unanimously adopted by the community? Except under a tyranny, such an attitude is unjustifiable and is an existential threat to the state. That is why the jurists have legislated for the threat to be cut off from its onset, before it becomes a movement. The apostate on the other hand is free to leave the land and reside outside Islamic jurisdiction, or remain in it without making his apostasy public. But if he makes the apostasy and rejection of the system public, remains in Muslim land, he becomes de facto an outlaw and a destabilising factor within society. Even if it is for the sake of converting to one of the non-Muslim groups of the Islamic land, the apostate still is guilty of rejecting the legislative authority. The non-Muslim groups on the other hand, pre-existed the Islamic state until it expanded to their lands. They never at any point rejected the legislative authority, but instead embraced it, along with the freedom of religion it grants them.