Saying this because I come from a Hindu family with non Hindu people who have married in. They're honestly not. Some Hindu families would oppose dating due to cultural reasons but it doesn't require for a person to convert if they want to marry a Hindu/Sikh if we're talking religion.
In Islam, dating in any sense is forbidden and a Muslim man can't marry a woman unless she converts.
Guess which one sounds more chilled?
A Muslim man can marry people of the book I.e Christians, Jews and they don't have to convert A Muslim woman can't marry someone out of Islam due to both scenarios the child has to be brought up a Muslim.
You didn't mention Hindus or Sikhs. You mentioned Christians and Buddhists which are (in this country anyway) probably the two least conservative religions on average. Ignoring Humanism if you classify that as a religion...I'd argue it's more of a belief.
Incidentally from my own personal experience I would disagree that Hindus and Sikhs are more conservative, but I can't claim to have huge familiarity with either religion.
If only you had read properly that I had also written "etc."