Praying for your friendnyou of course.
However church isn't really the best place too introduce people to Christ. In my opinion outsiders just feel excluded because they don't know the songs, liturgy, when to get up/ sit down, and just feel strange and alien. Church is usually better for people that are already Christian or used to be Christians in the past than for complete outsiders.
So if he won't come to church with you don't pressure him and don't be too disappointed. You can bring God's love and His message to your friend through your words and your lifestyle and your overall Christ-like-ness.
For example. if your friend says he's sad you could listen to his story and try to understand why he's sad. Most people don't really listen but bring some cheap advice instead of listening. So by really caring how he feels and what makes him sad you'll show your friend how Christians are different than the world and you are a mirror image of how God loves and care about us. That may bring God closer to your friend than a church service (especially if he's really an atheist that had no relation to religion before). You'll find plenty of ways to tell him about God, too, not in a preachy way, but just by witnessing about your personal experience.
Or maybe I'm wrong and going to church would open your friend's heart for God. Only God knows that, so I'll be praying the Lord will guide you both well.
