The "Born Muslim" Myth

 If we are to divide the Muslims in two groups, the born Muslims who reverted and the born Muslims who remained Muslims then we will run into a serious problem.

Indeed, those who believed, then disbelieved, then (again) believed, then disbelieved, then increased (in) disbelief - not will Allah forgive [for] them and not will guide them (to) a (right) way. Quran 4:137

Then that would mean that the so called reverts have already used up one of their "get out of jail free card" So to speak. Of course with no fault of theirs (born in the wrong family, wrong country). Islam is nothing if not fair.

The argument that since they (born Muslims but not yet "reverted") don't know about Islam hence not their fault is weak. They should be refereed to as converts not reverts. Not knowing or even knowing wouldn't change the fact that they were "born Muslim" if that was true. In any case "Muslim" is not a noun in the Quran, they have to submit, a conscious act in itself. Having an inclination/disposition
 (Fitrah) to submit to God is not the same as actually submitting to God. If that was the case then we better start referring to everybody as Muslims, don't you think?

 BTW As we see in this verse, God talks in terms of believer and disbeliever and not a Muslim and non Muslim, since the word Muslim in the Quran is not a noun. As far as disposition to submit to God is concerned it doesn't go away even after one starts to believe otherwise.

The verse in fact covers this particular aspect where one is given the leeway to go back and forth a limited number of times.
  
The actual notion is detailed in the Quran and it just says that we are born with the natural disposition to tell right from wrong and find God. I will post Quran 30:30, here and how Asad explains one of the crucial verses on the issue in full, sadly what the traditionalist have managed to get out of it is that women should not pluck their eyebrows lol

AND SO, set thy face steadfastly towards the [one ever-true] faith, [I.e., "surrender thy whole being"; the term "face" is often used metonymically in the sense of one's "whole being".] turning away from all that is false, [For this rendering of hanif, see note on 2:135.] in accordance with the natural disposition which God has instilled into man: [See 7:172 and the corresponding note. The term fitrah, rendered by me as "natural disposition", connotes in this context man's inborn, intuitive ability to discern between right and wrong, true and false, and, thus, to sense God's existence and oneness. Cf. the famous saying of the Prophet, quoted by Bukhari and Muslim: "Every child is born in this natural disposition; it is only his parents that later turn him into a `Jew', a `Christian', or a `Magian'." These three religious formulations, best known to the contemporaries of the Prophet, are thus contrasted with the "natural disposition" which, by definition, consists in man's instinctive cognition of God and self-surrender (Islam) to Him. (The term "parents" has here the wider meaning of "social influences" or "environment").] [for,] not to allow any change to corrupt what God has thus created [Lit., "no change shall there be [or "shall be made"] in God's creation (khalq)". i.e., in the natural disposition referred to above (Zamakhshari). In this context, the term tabdil ("change") obviously comprises the concept of "corruption".] - this is the [purpose of the one] ever-true faith; but most people know it not. Quran 30:30 

The verse also totally destroys the sectarian's worldly punishment for apostasy notion. God will deal with flip flopper on the Day of Judgement. Here on Earth I believe that we are all born with the disposition to find the Creator, Quran confirms this in the story of Abraham. Some scientific evidence is also beginning to emerge. I think the verse is really an administrative guideline to deal with the perpetual fence sitters and/or the professional crossover artists. The ultimate Judge is God alone.

Of course there are dozens of other verses that negate the apostasy claims.