is secularizing muslims a type of colonialism?

no, it's a backwards argument, because islam is a system of colonialism and dominance, itself. muslims don't come here as indigenous groups, they come to take part in colonialism just like christians did centuries ago.

decolonization is dechristianization is deislamification.

it's like arguing that arresting thugs at a violent nazi demonstration is a restriction on freedom of speech. now, i'm actually going to be a little more lenient than others, but i flip it over very quickly; the idea of staying back is that you'll harm less people if you just let them do their stupid march than if you start trying to shut them down, but the moment they demonstrate the least bit of threat, that calculus evaporates. so, what you want is for the nazis to have their march lined by very stern looking leftists that have the self discipline not to initiate.

but, at the end of it, is stopping the nazis a restriction of expression? no - because they're going to hurt people, if you let them.

and, similarly, conscious attempts to separate muslims from their faith are not the continuation of a colonial process, but the undoing of one.

it's a false equivalency.