His arguments are straw-man arguments and childish secondly he is after all preaching to the converted.
Let me provide the context that Dr. Zakir Naiks claims is missing when people quote the given suras:
Islam divides the world into Dar-ul-Harb and Dar-ul-Islam . Islam is at perpetual war to bring Dar-ul-Harb into the fold of Islam and make it Dar-ul-Islam. This is not in dispute but is conveniently ignored when Muslims go into defensive mode. Given the context please read the suras again. Now his example regarding the Vietnam war, first he slyly drops the word "soldiers" in his second use of the Presidents order, second it is different from the surah where it says kill all kafirs, which is equivalent to the President instructing his soldiers to kill all non-Americans. Context or no context now it means exactly the same thing "kill the kafirs where you find them" since Islam is at perpetual war with kafirs. The rest is just more of his typical illogical drivel. Now let me quote a true scholar of Islam, Ayatollah Khomeini not some intellectual fraud that can impress people that lack the courage to critically examine their own dogma or his arguments, but someone who knew Islam better than Dr. Zakir Naik and for that matter most Muslims in the world.
"Islam makes it incumbent on all adult males, provided they are not disabled and incapacitated, to prepare themselves for the conquest of countries so that writ of Islam is obeyed in every country in the world.
But those who study Islamic Holy War will understand why Islam wants to conquer the whole world ... Those who know nothing of Islam pretend that Islam counsels against war. Those [who say this] are witless. Islam says 'Kill all the unbelievers' just as they would kill you all! ... People can't be made obedient except wit h the sword .. There are hundreds of other [Koranic] psalms and Hadiths urging Muslims to value war and to fight. Does all that mean that Islam is a religion that prevents men from waging war ? I spit upon those foolish souls who make such a claim."
I don't think I need to add to such a clear and well articulated understanding of the Islamic religion. This clear exposition is a dictionary doctrine of Jihad. If the Koran is the word of God as Muslims believe then who is being more logical Khomeini or the Muslims that pretend otherwise.
Please don't assume that we are living in the 7th century, people have advanced sufficiently to spot a con job when the see on (though after reading some post s that may not be 100% true).