Some people have an inclination to Sikhism (or any spirituality) but they are intellectually bound by their own concept of reality. And they feel they can't make the leap to commit to a spiritual discipline. The person wants to live in their head, and they are worrying about metaphysics and reasoning. If that's the case, they can't walk this path. Guru said if you want to walk this path, then put your head in your hands and make it as an offering. This means we give up our mind, and follow our heart on the path to spirituality. If you are thinking about foundation, metaphysics, theism and atheism and all of that... then do whatever you have to do to get to the place where you can give up your mind. This path is not for intellectuals.
Sochai Soch Na Hovai Je Sochi Lakh Var
"By thinking, God cannot be reduced to thought, even by thinking hundreds of thousands of times."
No matter how much you try to conceptualize God, you can't. No amount of philosophizing, reasoning, thinking, rationalizing will give you one taste of it.
So what can you say to a skeptic? Just say bless you. I love you.
You can give them an opportunity to give them an experience, but you can never convince anyone. The mind is a trap. If you think you can figure everything out you spend your whole life thinking in a circle, and you miss what is right in front of you.
It's better to just chant the Naam. Surrender your little self, and experience the big Self, which is far beyond the mind. The mind is so small, God is beyond bigness.
Editor's Note: This article was originally published on March 9th 2016