Some do some don't

I would think that in order to practice Marian devotion in the same way as Catholics, that would be necessary. One would need to believe that the saint that is no longer living in this physical plane would be able to hear the prayers of those still alive on earth in order to intercede for them as Catholics believe.

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But God hath chosen the foolish things of the world to confound the wise; and God hath chosen the weak things of the world to confound the things which are mighty;
1 Corinthians 1:27