No JP is not a good source and I will remove it pending a better source. My Issue is JP has an agenda. I came across them when checking the edit which one editor put in. But They seemed very keen on JP when one editor used it to say Muslims were a tiny tiny percentage. (i never knew JP up until then). See the edit history for this edit. Now here is what I do know. Go and look at all the notable Seer, start with NDour, what is his religion? 100% Muslim. What I am realizing is most Serer are Muslim people. Synergistic is  not unique to Africa, it is in every corner of the planet where Islam and Christianity live. So Islam accommodates this, all the key historian on Islam say this. especially David Robinson and others. Vodon per Kwami is a good example. Even in the Caribbean google Jesus in the morning Vodon in the evening. These people are classified as Christian.  I do not think we will get exact stats but should not go with the POV that most Serer practices their religion, which is a myth. note  any strange ip edits can be investigated.