Easily. Invie them to join you to your church. When they come they may love praising God and who knows, they may come weekly. Praise the Lord.
Answer:
Don't bother. A person prefers to find their own way in these matters. Leave your friend alone or you'll have neither a convert or a friend. You might also ask yourself what an atheist would have to do to convince you that there is no God. An atheist will be as strong in his convictions as you are. What will you do if his arguments are better than yours? How will you feel if he sits through your efforts (or visits your church) does not participate and points out all the fallacies in what was observed and said.
The world may be more willing to accept people who are different if it wasn't for religion. On the other hand, religion could be preventing people from doing things that may be considered worse.
because it could be against their religion
Cultural Diffusion
It rarely happens. When it does, it is because they think their religion is better. It is ironic that religious groups that force their religion on others hate it the most when other do the same to them.
For similar reasons that other people follow the Christian religion, the Islamic religion, etc. - basically, because the believe in it.
Hinduism appeals to people of other religion because it offers them the freedom to practice. Other people find Hinduism as an integral religion.
missionaries
Buddhism was the religion that appealed to people in india and parts of asia (:
christians
religion is shown negatively because of the different interpretations. people do not look at the firm foundations of religion but instead concentrate on what other people say.
Socialize them. Play with them, introduce them to other people, pet them, etc.
Judaism is a religion of one people, but accepts and welcomes proselytes from all other nations.