Salaam Alikom
I just want to add one line and I want every one think before even try to reply if people get offended and don't like the term Kaffir, who would you like to invite them to Islam by insulting them because for them its an insult and as some of you said its truth always hurts, but we need to be careful how we act when we make dawah, calling people right and left Kafir wont achieve any dawah.
Our job is to convey the message of Islam beautifully and clearly. It is Allah Who guides whomsoever He wills. We should not say that we are 'converting' someone. People convert themselves. It is a kind of tawbah (repentance) and qubul (acceptance) for them. They are turning to Allah and accepting the true faith.
When you speak to Christians, emphasize what Allah says in the Qur’an: “And argue not with the People of the Scripture unless it be in (a way) that is better, save with such of them as do wrong; and say: We believe in that which hath been revealed unto us and revealed unto you; our God and your God is One, and unto Him we surrender.” (Al-`Ankabut:46)
Sheik Yusuf Estes, said
Calling non-Muslims to Islam can’t be achieved through talk about Islam only. There must be a practical model that should be offered by the one who calls others to Islam. In today’s world, Islam is in no need for orators who can captivate the audience with their resounding words. Rather, Islam is in a real need for those who really practice its teachings and try their best, while being guided by their good example, to call non-Muslims to Islam.
In other words, those who call to Islam should practice what they preach. Their actions should speak louder than their words.
In short, those who call others to Islam should make use of the following tips:
1-The one who intends to call others to Islam should practice Islam in the right way. After that, he can call others to Islam through wisdom and fair exhortation and he should be keen that his “walk follow his talk.”
2- There should be no compulsion to the target audience, as people usually reject those who compel them to accept an ordinary matter, let alone a creedal concept.
3- The da`iyah should be thoughtful. He should not say, while trying to call a Christian to Islam, for example: “How shameful that 1= 3 and 3=1.”
4- The da`iyah must be himself in the sense that he is not supposed to act the role of an instructor or a good public speaker while actually he isn’t.
5- The da`iyah should not expect that his target audience will change their beliefs 100%. Rather, the da`iyah should expect from them to accept the basics of Islam and to gradually try with them to change some of their distorted beliefs.
6- A gradual approach in da`wah is so beneficial and will bring about good results. The Prophet (peace and blessings be upon him) spent 13 years in Makkah trying to anchor the basic concepts of Islamic creed among new Muslims.
7- In calling non-Muslims, we should concentrate on creedal concepts and we should not demand the new Muslims to do more than what Allah obliges them to do."
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http://www.islamonline.net/servlet/...h-Ask_Scholar/FatwaE/FatwaE&cid=1119503546774