Sahiek Ahmed Deedat was the great source of refuting Christians by many Modern Muslim scholars...
Zakir Naik shined once by studying his materials in deep.
Zakir Naik even used Harunyahya's ( harunyahya.com )materials for refuting "Atheist" people
But What about these leaders ??
In reality they all hates Wahhabism/Salafism
He used to celebrate Mawlid ...
Sheikh Ahmed Deedat used to celebrate Mawlid un Nabi Sal Allah u Alaeh e Wasalam
Ahmed Deedat's views on celebrating Mawlidunnabi & the difference in Christmas.
The explanation of Ahmad Deedath's speech by the audiance:-
Prophet ISA (Alaihisalam) born is also a good day.
but the day (25 december) is not proved.
but our prophet Salallauhu alaihiwassalam borned is proved. We all shows the gratitude to the Creator.