An argument I had with another atheist
So I had this argument with an atheist where he said that somebodyhad proved using modal logic that theism is coherent, I didn't understand what that meant since I do not understand modal logic, and that therefore he is no longer be considered irrational for their belief in God and since they have experienced God is names that they can rationally say that God exists.
What I said is that that seems ludicrous because what if I say that I have experienced a unicorn, does this mean I can rationally say that unicorns exist? he replied that I would only be one person and I guess rationality in numbers.
We also talked about this weird thing that theists base their beliefs off of the fact that God exists. which also seemed absurd to me, I don't think most theists have as a premise for each of their beliefs God is real.
What does everyone think of these arguments?