As Muslims we are called to make Dawah, to spread the message of Islam. This might be to our brothers and sisters in Islam and it might be to non-Muslims. Regardless, we really need to think about how we give the message. No need to dwell on the bad examples because I am sure we already know some. I've tried some different methods of Dawah, for example PalTalk, Twitter, and of course this blog. I've learned a lot along the way.
Firstly, what is our intention. Really. Are we working to spread the truth and remove falsehood? And, is it for pride or for Allah? Allah ta'ala says, "Thus We have appointed you a model Ummah, that you may be witnesses against mankind, and that the Messenger may be a witness against you". [Quran 2:143]
Next, what is our method. From my experience, attacking / debating and anger are horrible Dawah tools. Neither is slandering a person or a religion going to help in Dawah. In fact they will do the opposite and people will become entrenched in their position. Allah says, "Invite to the Way of your Lord with wisdom and fair preaching, and argue with them in a way that is better. Truly, your Lord knows best who has gone astray from His Path, and He is the Best Aware of those who are guided." [Quran 16:125]
Instead, set an example. Be humble. Be honest. Be trustworthy. Don't be afraid to say "I don't know." If you are calling someone to something, you should act upon that yourself. Know your knowledge and don't speak on issues you don't have knowledge about (on other religions and Islam). Don't get emotional, be logical and calm. Give a message suited to the listener (level, age, interest, et cetera). Educate yourself! Non-Muslims usually have similar questions, learn about those issues on a deeper level.
May Allah bless us with guidance.
May Allah bless us with knowledge that benefits us.
May Allah bless us with wisdom and patience.
May Allah fill our hearts with mercy.