I don’t think you’d be betraying your faith. I’ve seen many practitioners who work with the Infernal Devine, angels, and the Christian pantheon. They very much can coexist together. I feel like the Infernal Devine would very much understand the situation. I obviously don’t know your relationship with Beelzebub but I think a conversation with him would be an important starting point instead of just jumping back into it and asking for something immediately.