1) marriage under SMA would be considered valid even if boy subsequently converts to islam
2)conversion to Islam is done by taking Shahadah oaths before Nikaah, adopt a Muslim name,. local imam would issue certificate of conversion in this regard
3) According to Mulla's Principle of Mohammedan Law any person who
professes Mohammedan religion that is, he acknowledges that there is but
one God and that Mohammad is his prophet is a Mohammedan. Such a
person may be a Mohammedan by birth or he may be a Mohammedan by
conversion. It is not necessary that he should observe any particular rites or
ceremony to be an orthodox believer in the religion, no Court can test or
gauge sincerity of religious belief. It is sufficient if he professes
Mohammedan religion in the sense that he accepts prophetic grant of
Mohammedan (section 19, Chapter 2, page 19 of Mulla's Principles of
Mohammedan Law). Thus the r