Of course you can call faith attachment, but then there are positive and negative attachment.
If we talk about Buddhism , when you start to study and practice, you need to have faith in what The Buddha taught,
because you can not be certain from the beginning.
During your practice you will then change your faith to knowledge, when you experince for yourself that what The Buddha taught is correct,
and in the end you can let go of your attachment (faith), because you have experinced it all for yourself.
If we look at the N8P the first truth is Right view, you can not start your practice with Right view, because you simply don't know, but in the beginning
Right view is simply Faith.
If you let go a little, you will have a little peace. If you
let go a lot, you will have a lot of peace. If you let go completely,
you will know complete peace and freedom.