Blessings Nindoja,
First off you are setting yourself up for frustrations if you feel the conversion is up to you.
Only the Spirit of God can convert a heart. But it is within your power to introduce Christianity to your friend. The best way is to "live" a sermon. Non-Christians spend more time looking at how we live our lives than what we say. They tend to know what our Bible says and what we should and should not be doing and they pay attention.
After awhile they will come to you with gentle questions. Never ever attack their right to freedom of religion. Never attack their religious belief. They will get just as defensive and non accepting as a Christian would be if a non Christian attacked the name of Jesus. We would have no desire to hear anything else they have to say. Much less give our lives to the doctrine they are speaking of.
We as Christians reflect our God. When people see us they see a dim reflection of who our God is. And if we spend time attacking they see that as an attribute of God and normally have no desire to serve or follow a God who condones personal attacks.
Like Gamecock said, pray, pray, and pray some more.
~ShekinahMoon~
"For I am a reflection of the Shekinahs"