When someone denies that Islam is the truth and the only acceptable religion to God Almighty, to me it is as if they are denying that there is a sun. How can you deny the sun? It is shining on you as you speak.
And that person might say back to me, “Oh but I don’t believe in the sun and you are the one who is delusional.”
That’s fine, but that doesn’t change the manifest reality. Just because there might be a diversity of opinion on the existence of the sun does not take one iota away from the fact that it is there, shining bright.
People who don’t understand the point of the analogy I am drawing here will inevitably comment: “Yeah, but the sun is a verifiable fact whereas religious preference isn’t!”