My point is, as an example, democracies with dominant religion as Christianity has its religious imprints within the governing body. A simple example to prove this is that all public holidays mostly are serving the dominant religion. (I didn’t say Christianity is a common trait of successful democracies).

Wouldn’t etho/religious supremacy apply here ? Why do you have the lens when you look at a country like India ?

Disagree. Most democracies, even though on paper are secular, always have imprints of the dominant religion. Democracies dominant with Christianity haven’t “exploded”, so why would this ?