How can we reconcile that Allah is the Healer and that the Qur'an is a healing, and is the Qur'an considered a means of healing, or does it heal because it is the word of Allah and one of His attributes? And does not understanding these doctrinal issues affect faith?

Allah alone is the Healer, and His words are a healing for what is in the breasts and a mercy for the believers. The Qur'an does not heal by itself, rather it is a means of healing that Allah has made it to be. The conditions for Ruqyah are that it must be with the words of Allah or His names and attributes, and in the Arabic language, along with the belief that Ruqyah does not affect by itself, but only by the permission of Allah Almighty.