The couldn’t put a LEGO set together, let alone a functioning nuclear device.
Dirty bombs?
Pakistan is the only muzzy majority country with feasible claims of having nuclear weapons. More likely, they have nuclear devices, which are neither hardened or ballistic (although they claim otherwise).
Even if that were true, the difference between creating a "weapon" that can be set off at a dedicated site, with months if not years of preparation under the complete direction of a team of top muzzy "scientists", and having some illiterate caveman assemble a nuclear device (much less smuggle in the components) that's operable is equivalent to the difference between a successful moon landing and return, and throwing a rock at the moon.