Need to complete a empirical analysis with appropriate data. One should apply to

Need to complete a empirical analysis with appropriate data. One should apply tools i.e. correlation and regression analysis.
I have difficluties finding data on religion in asian countries (last ten years 2010-2020)
Data sources e.g. UNCTADstat, OECD Statistics, DataBank | The World Bank
Questions:
– Where can I get the data regarding relegion from the last ten years?
– How do I merge the different data in a efficent way?
– Is the data I have collected sufficient? (raw_data_from_world development_indicators file)
Please see “data example file” from professor for reference attached below