Yes, because in Islam we have unlimited polygamy (Quran 04:03), Muslims have new type of Jihad called bear children and through them to the streets, so that they will become more and more, look at this man who married 58 times, how do you expect all his children to get proper care and proper education, that is why most Islamic countries are economically poor and classified as developing countries (which will never develop).
I keep hearing that thousands of Muslims have converted to Christianity, but it has to be in secret because Islam dictates that any who leaves the Muslim faith be killed. Is this true? (The conversion to Christianity as well as the threat of being killed because of it?)I
Yes, death is the punishment for the apostasy:
Sahih Bukhari, Volume 9, Book 84, Number 57:
“Some Zanadiqa (atheists) were brought to 'Ali and he burnt them. The news of this event, reached Ibn 'Abbas who said, "If I had been in his place, I would not have burnt them, as Allah’s Apostle forbade it, saying, ‘Do not punish anybody with Allah’s punishment (fire).’ I would have killed them according to the statement of Allah’s Apostle, 'Whoever changed his Islamic religion, then kill him.’”
Sahih Bukhari, Volume 9, Book 84, Number 58:
"*…Behold: There was a fettered man beside Abu Muisa. Mu’adh asked, “Who is this (man)?” Abu Muisa said, “He was a Jew and became a Muslim and then reverted back to Judaism.” Then Abu Muisa requested Mu’adh to sit down but Mu’adh said, “I will not sit down till he has been killed. This is the judgment of Allah and His Apostle (for such cases) *and repeated it thrice. Then Abu Musa ordered that the man be killed, and he was killed…”
Sahih Muslim, Book 016, Number 4152:
"'Abdullah (b. Mas’ud) reported Allah’s Messenger (may peace be upon him) as saying: It is not permissible to take the life of a Muslim who bears testimony (to the fact that there is no god but Allah, and I am the Messenger of Allah, but in one of the three cases: the married adulterer, a life for life, and the deserter of his Din (Islam), abandoning the community."