Converting Subjects

[Sharpie The Dragon]

The enforce religion button is useless since vassals can immediately choose to reconvert to their old religion. Tried this twice and my vassal of Malacca went from Theravada back to Sunni again, giving them a free 200% liberty desire.

Just wanted to vent about this, this should not be a thing allowed by the AI, extremely annoying when you have a subjugation CB (playing as Ayutthaya with their mission tree) against Malacca with a million AE on the subject, which makes improving relationship very difficult.

[grotaclas]

The button works fine.
You just hit a very special case by converting a country in the malay culture group to a religion in the eastern or dharmic group which has sunni as their dominant religion. Then they can use the decision embrace islam[eu4.paradoxwikis.com] to convert back.
Instead of venting here, you could have a look at the official bug reports forum if it has already been reported as a bug that the decision is available for countries which have been force converted. If it has not been reported yet, you could create a new bugreport.

To avoid the problem in your game, you could make sure that sunni is not dominant before converting them. A religion is dominant if it has the highest development of all religions in that country. So you could feed them provinces of one non-sunni religion to make that religion dominant(e.g. Theravada or Hindu).