अश्रद्दधानाः पुरुषा धर्मस्यास्य परन्तप।अप्राप्य मां निवर्तन्ते मृत्युसंसारवर्त्मनि॥
aśraddadhānāḥ puruṣā dharmasyāsya parantapaaprāpya māṃ nivartante mṛtyu-samsāra-vartmani
Word by word
The verse says
People who will not put their weight on this teaching do not reach me, Arjuna. They come back, onto the road of dying and being born again.
In plain words
Aśraddadhānāḥ — without śraddhā.
That is usually translated as faithless, which makes it sound like a test of belief. It is closer to unwilling to lean.
You can agree with something completely and still never put any weight on it.
Where you've felt this · in sport
You cannot learn to ride a bicycle with one foot hovering an inch above the road. The hovering is sensible. It is also the exact reason you keep wobbling and stopping. At some point the foot has to come up, and that is the part nobody can do on your behalf.
Going deeper
Faith in this book is a matter of weight, not opinion, and the difference decides how this verse reads.
Śraddhā is what you actually lean on. It shows up in behaviour, not in what you would say if asked. A person can hold a belief firmly and never once act as though it were true, and by this definition they do not have faith in it at all.
Read that way, the verse stops being a threat aimed at unbelievers. It is a description of a mechanism. Nothing you refuse to put weight on can hold you up, and that is not a punishment. It is what weight means.
Which makes the practical question quite specific. Not whether you believe any of this, but whether there is anything in your week that would look different if you did.