Answer: The most successful and beneficial way for Da'wah in the present time is to utilize the mass media. It is successful, although this can be a double-edged sword. But as long as the media such as radio, press, and television are used for Da'wah to Allah and to guide people to the teachings of the Messenger (peace be upon him), this is certainly a great achievement through which Allah benefits the Ummah (nation based on one creed), wherever they are.
It can also benefit non-Muslims, to help them know about Islam, understand it, learn its virtues, and realize that it is the only way to success in this life and the Hereafter. Du'ah (callers to Allah) and the Muslim rulers are obligated to participate in this, as much as they can, making use of the radio, the press, the television, the speeches delivered in gatherings, and also through broadcasting the Friday Prayer Khutbah (sermon), and other means that will convey Al-Haqq (the Truth) to people in all the spoken languages, until Da'wah and advice reach the whole world in their own languages.
This is obligatory upon all the scholars, Muslim rulers, and Du'ah to Allah (Glorified and Exalted be He) who are able to do it, until the Message has spread throughout the world and in all the spoken languages. This is the Conveyance of the Message that Allah (may He be Praised and Exalted) orders when He says: O Messenger (Muhammad ﺻﻠﻰ ﺍﷲ ﻋﻠﻴﻪ ﻭﺳﻠﻢ)! Proclaim (the Message) which has been sent down to you from your Lord.
The duty of the Messenger (peace be upon him) was to convey the Message, as did all the Messengers of Allah (peace be upon them) and so should the followers of the Messengers. The Prophet (peace be upon him) said, "Convey (what you know) from me, even if it is a single Ayah (i.e., Qur'anic verse, any prophetic teaching)." When the Prophet (peace be upon him) delivered a Khutbah to the people, he used to say, "Let those present inform those who are absent, for perhaps the one informed comprehends (it) better than the one who heard (it)."
Therefore, all Muslims, whether they are rulers, scholars, business people, or others, are obliged to convey on behalf of Allah and His Messenger (peace be upon him) this Din (Religion) and to explain it to people in the various living languages, in a clear way.
They should explain the merits of Islam, its rulings, benefits, and truth, so the Message may reach its enemies, those who are ignorant of it, and those who seek to know it. And Allah is the One who grants success!
Finally, I advise my Muslim brothers in Pakistan, Bangladesh, and everywhere to have Taqwa (fear Allah as He should be feared), act in accordance with Allah's Shari'ah, observe what Allah enjoins and refrain from what He forbids, avoid any form of Shirk (associating others with Allah in His Divinity or worship), be it small or great, minor or major, and devote 'Ibadah (worship) purely to Allah Alone in all times and circumstances.
I give the sternest warning against what many people fall into, of becoming attached to or seeking the help of the dead, whether the prophets, the Awliya' (pious people), or others, as I also warn them of becoming attached to trees, stones, idols, or other inanimate objects, because 'Ibadah is the Exclusive Right of Allah Alone, with no partner or associate.
Allah (Exalted be He) says: And your Lord has decreed that you worship none but Him. Allah (Exalted be He) also says: And they were commanded not, but that they should worship Allâh, and worship none but Him Alone (abstaining from ascribing partners to Him) He (may He be Praised) also says: And the mosques are for Allâh (Alone): so invoke not anyone along with Allâh.
Therefore, it is obligatory upon all humans and Jinn to dedicate 'Ibadah to Allah Alone, no one else besides Him, and to fulfill all the Rights owed to Allah, which He has enjoined on them, such as Salah (Prayer) and the other acts of 'Ibadah. They also have to avoid what Allah prohibited and to follow Al-Haqq and be patient with it. They should co-operate in piety and Taqwa wherever they are and to well comprehend their Din.
They should also strive to recite the Qur'an and contemplate and understand its meanings, and act upon its teachings, because it is the Book of Allah, in which there is guidance and light. The Prophet (peace be upon him) said in the Farewell Hajj, "I am leaving you that which, if you adhere to it, you will not go astray: the Book of Allah." Allah also says: Verily, this Qur'ân guides to that which is most just and right He (may He be Praised) also says: Say: "It is for those who believe, a guide and a healing."
It is obligatory on all Muslims to contemplate and understand the Qur'an, and act according to it. The same applies to the Sunnah of the Prophet (peace be upon him). They should study and memorize what they can of the Hadith and act according to them. They should resort to the authentic Sunnah to understand the Qur'an, as it is the second revelation and the second source of the Shari'ah, which is obligatory to be referred to for explanations of what is not clear in the Qur'an and its rulings.
This is my advice to all Muslims and they should not be preoccupied with worldly life and desires and become heedless of the Hereafter. It is obligatory that they should use this world for attaining the Hereafter, and make it their bridge to the Hereafter, for them to achieve success and enter Jannah (Paradise). Allah is the Only One who grants success. May peace be upon our Prophet, Imam (leader), and master Muhammad ibn 'Abdullah, and upon his family, Companions, and those who follow him in righteousness.