It seems to me that you can use any belief system (including atheism) in a way that excludes, oppresses and bullies people. At the same time you can use precisely the same belief system to include, help and cherish people.

After a fairly rough Roman Catholic schooling I had a fair prejudice against Christianity generally but one day I broke down outside a complete strangers house and the help, friendliness and consideration they showed me and my family was extraordinary. From the stickers on their car and the books in their house they were evangelical Christians and I must admit I was ashamed of some of my easy assumptions.

I now try to see the person underneath the religion and react to that rather than lumping people into categories.

On that basis the question of proseletysing seems to me a question of behaviour. There is no problem with anyone trying to persuade anyone of anything as long as there is mutual respect. If there is no respect then the behaviour is not acceptable.