unable to pull in Pages or CPT

have you test with page_id=2 instead p=2 as in url query for page ?

WHAT is C.P.T. ? cross portal theme ?

Example as in url with CPT named xilifunctions

https://dev.xiligroup.com/?xilifunctions=function-xi_postinpost

https://dev.xiligroup.com/?cat=393&post_type=xilifunctions

very easy to see if permalinks is not active

Queries are well documented in http://codex.wordpress.org/

example for current post (p) : ‘p=17’

example for custom post type (CPT) with name animals and searching one post with slug yellow-cat : ‘animals=yellow-cat’

example for CPT sharing taxonomy category with current post : ‘cat=27&post_type=animals’

Technically CPT seems to be an amazing solution but don’t forget that in data-model approach and query point of view it can be a nightmare if the preliminary study is no well done.

Hope that help to fin the road