So, let me see, about 50% of the forum have said that they believe in rebirth but only 25% have said that rebirth matters greatly to their practice. Interesting
I follow Nanavira in understanding "punabhava" according to a combinatorial model of static and dynamic aspects of dhammas, but this means I also generally understand and agree with the claim that punabhava is itself not part of paticcasamuppada. Thereby, an understanding (or mere belief in) punabhava is a separate thing from paticcasamuppada (the core of the Dhamma, as it were, and thereby that which matters greatly to the practice).
Thus, any such results cannot surprise me, as there is no necessary correlation.