Can dewas interfere with our practice of dhamma? If so, how?
Devas are those beings in higher realms than us. There are good and not so good devas. Those devas who are our "neighbours" can influence our worldly lives. Buddhists perform chanting and puja at the Bodhi trees for purpose of requesting worldly favours and protection from them. Before formal chanting, we always invite the devas to participate and listen and share our merits. This is the Buddhist way of seeking "spiritual" protection.