It is well known in Faerûn that those who die without a patron deity to send a servant to collect their souls from the Fugue Plane at their death will spend eternity writhing in the Wall of the Faithless or disappear into the hells and infernos of devils and demons. In ALFA, this is represented by the a small (a few percent) chance for a resurrection if your PC is killed. If you have no patron diety in the diety field on character creation, your PC will not be given such a possibility.
Having a patron deity does not preclude a mortal from worshiping other deities as need arises. On the contrary, it would be considered foolish to NOT seek the favor of a diety who's portfolio pertains to your current sitution.
For example, Tymora (Lady Luck) is often thanked when things happen to work out or invoked when a risk is about to be undertaken, regardless of the person's patron. Similarly, a wizard heading into battle is well advised to give obeisance to both Tempus and Mystra.
Major Deities of Faerun
Other Deities of Faerun
Drow Pantheon
Dwarven Pantheon
Elven Pantheon
Gnome Pantheon
Halfling Pantheon
Mulhorandi Pantheon
Orc Pantheon
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