Archaeology is a science. Sciences give useful information regarding the physical world. Archaeology is an intellectual discipline, not a spiritual attainment. Archaeology can reinforce various faiths. Any evidence for Christianity can also be used to argue persuasively for Islam, and even other religions.
Faith is a loose term generally applied to emotional attachment.
Emotional attachments are not spiritual attainments. Ascetics and libertines, gnostics and agnostics, believers and doubters, are all targets for my criticism. Anyone who thinks he can escape criticism and vituperation is insane. Truth is formless. Religions, archaeologies, systems of magic or taboo are all forms.