This is a long topic! You can download Dr. Zakir Naik’s lectures on Christianity and Islam; as they are useful.

I have a Christian friend. I gave him Dawat of Islam, because he lives in Muslim society. He has some basic knowledge of Islam. He is Christian but he himself does not know very much about Christianity. He asked me to prove logically that what is the difference in Islam and Christianity? So what differences should I point out to him?

Inviting others to Islam | August 21, 2015 3:37 am
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Remember how I asked u a question and u told me that I have to work on my intention? I love talking about Islam and spread knowledge but I find it VERY difficult. It’s kind of frustrating because I don’ care whether people criticize me or praise me for my good deeds. How can I purify my intention when I love doing it? It’s kind of bothering me. I don’t know if I’m doing it for Allah or for out of pleasure. I’m scared my deeds won’t get accepted
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what is the reward for a person to call someone to Islam,and if the person embraces ISLAM and reward for converting a person to ISLAM as their is a procedure to convert someone to Islam.