What are the points on which we should concentrate to make convert a christian guy to a Muslim?

You visit your imam together and ask him for instruction. You can't do it yourselves.

Does this person want to convert? Do they believe strongly in their faith? Don't assume that you can convert someone simply by pointing out some good points. All religions have good points.

Think about this: would this person be able to convert you? Why or why not? He may feel the same way about his beliefs.

Why should they? You do not convert someone, some changes if they wish to.

I have a better Idea... why don't you convert to Christianity? Don't like the idea, then why are you trying to convert someone else.

You would not be able to convert any body with out knowledge you both need to study about Islam also will suggest to go a masjid and consult an Imam, with out knowledge will not work, Thanks.