Dr. Zakir Naik is a snake-oil salesman or World's Greatest Showman or both. He looks and sounds just like a "moderate" muslim - all soft, nice, affable and gentleman like on the surface but he is a chameleon underneath. In reality the man is dangerous. He manipulates weak minds.
This Muslim preacher has now aquired a wide following among South Asian Muslims and you, Sharafuthu, may have become one of his victims.
He will tell you "O ye who believe! Ask not questions about things which if made plain to you, may cause you trouble. Some people before you did ask such questions, and on that account lost their faith." (Surah 5:101-102)."
He will also tell you "The Holy Prophet himself forbade people to ask questions ...so do not try to probe into such things." (The Meaning of the Qur'an, Maududi, vol. III, pgs. 76-77)
But I suggest that you examine his teachings more carefully and with an open mind. You must not believe what he says blindly without investigation. Therefore I suggest you learn more about Dr. Zakir Naik. A good place to start would be "World’s Greatest Showman" by Ali Sina and Rebuttals to Zakir Naik at WikiIslam.
Ali Sina on Dr. Zakir Naik:-
A good magician is dexterous and his moves are swift - so swift that they are hard to detect. However, if you replay his acts and watch then in slow motion, or even frame by frame, you may be able to catch his tricks. This is what I have done with Dr. Naik's talk.
There is no doubt that Dr. Naik is great. One must acknowledge the merits of his opponent. His greatness is in his ability to twist the truth. He is dexterous with words and has an excellent memory for remembering the verses of the Quran. If he was a lawyer and I was a criminal, I would want him as my attorney.
Sharafuthu, I hope you will take my advice and proceed to learn more about Dr.Zakir Naik.....