I will let the Campaign Setting guide speak for itself:
According to the 3.0 Forgotten Realms Campaign Setting pg. 24
"Unlike clerics, druids, and paladins, Faerunian rangers do not have to choose a patron deity until they reach 4th level and acquire divine spellcasting ability (without a patron deity, a ranger cannot cast spells) Many rangers choose a patron deity before then, but others start by devotion to a ranger's way of life instead of to one of the gods. Rangers and druids have similar preferences for deities, although some rangers with odd interests (such as hunting undead) choose different patrons."
According to the 3.0 Forgotten Realms Campaign Setting pg. 24
"Unlike clerics, druids, and paladins, Faerunian rangers do not have to choose a patron deity until they reach 4th level and acquire divine spellcasting ability (without a patron deity, a ranger cannot cast spells) Many rangers choose a patron deity before then, but others start by devotion to a ranger's way of life instead of to one of the gods. Rangers and druids have similar preferences for deities, although some rangers with odd interests (such as hunting undead) choose different patrons."
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