If you’re going to try to do apologetics with an atheist, why not use, say, St. Thomas Aquinas’ 5 proofs for the existence of God?
Well, use just one. Say something to the effect that we believe that things have been created. Sometimes, there are several levels of that, but when we get to…created by…created by…created by…we finally come to the beginning…to something which is uncreated.
Tell him, we don’t believe it goes back indefinitely, infinitely, the pattern of created, created, created, created. We believe it needs a beginning. That beginning, we call “God”. We believe him to be the uncreated, Creator.
Another way is to tell him to look at the universe and explain it’s so orderly. Were it to have evolved by a series of random, fortuitous “accidents” and mutations, one would expect it to be quite chaotic, but it’s not.
We have, probably trillions and trillions, and trillions of things all coming together to form, say, life. If just ONE would go wrong…say something as temperature, no life.
Oh, have you also ever seen the movie,** “Expelled: No intelligence allowed?**” Why don’t you see that? You probably can find it at your local library. It argues to the point why we should allow schools to teach intelligent design. Anyway, good luck!
Hail Mary, Full of Grace, the Lord is with thee. Blessed art thou amongst women, and blessed is the fruit of thy womb, Jesus. Holy Mary, Mother of God, pray for us sinners, now and at the hour of our death. Amen.