As an agnostic that has many discussions with people of faith, the first thing to realize is that the two of you are often coming from completely different world views. That doesn’t mean we have nothing in common!
I would argue that debates often seem to go nowhere but you’d be surprised at those listening in the background and what they pick up and process…this goes for both sides!
Talking to anyone needs to start with areas you agree on. What’s not necessary is telling the other what they believe. Instead, ask and listen to the answer. Make sure you understand what they are saying. You don’t have to agree but always remember, everyone has a right to their beliefs and thoughts. No one likes to be told they’re wrong. It’s much nicer to say instead, I think differently or my faith says. Confrontations just lead to everyone digging in their heels and no longer hearing the other at all.
I enjoy hearing various religions views and how and why they believe what they do. I have no trouble recognizing that my views may be very different. Sometimes they aren’t! Some atheists have recently left religion and some of those still carry anger and resentments. They need time to heal before they are ready to hear you. Some atheists are atheist for no actual reason…they were raised that way, they just never believed, etc. These atheists probably haven’t thought through why they are atheists…some Christians are the same…they were just raised that way.
Finally, some atheists have thought long and hard about God, the supernatural and faith. They have reasons for their disbelief…reasons you may not be able to overcome. Reasons that may challenge your beliefs. Just be aware that atheists are no more a single block of people than Catholics or Protestants are…they come in many flavors.
I know many atheists that would prefer that an apologist or street preacher never approach them. They just want to be left alone on the religion front. It’s your belief that they need to hear the Gospel, not theirs! Above all, remember they are humans, too!