The mountains were known for idol worship (Deuteronomy 12:2), and Israel was drawn to the hilltop shrines (Hosea 4:13). This verse can be seen as a rhetorical question expecting a "no" answer: The gods of the hilltop shrines cannot save anyone.
Others understand the mountains to be a symbol of the Lord’s strength (Psalm 95:4). In that case, the question would be taken literally (From where does my help come?), with the answer in the next verse.