"Voodoo and Wicca aren't related to Egyptian culture directly, although I few Wiccans worship Egyptian deities. The magic they practice is called heka."
Actually Zen, I wouldn't necessarily say that folks who are Wiccan and worship ancient Egyptian netjeru (deities of Kemet) practice heka. More likely they practice magic/witchcraft with the netjeru plugged into the Wiccan formats; otherwise they wouldn't still be Wiccans, they'd be some form of Kemetic (worshippers of the netjeru within a context as close to the original as possible). Folks who are Wiccan and worship the netjeru within Wiccan formats generally end up being categorized as Tameren Wiccans. This is based off one of the names of Kemet for itself, ta mery(t), meaning "Beloved Land" as Kemet was considered beloved of many things.
Folks who practice heka (not exactly a plug in word for magic/witchcraft) are generally Kemetic. Anyone who practices heka must accept the existence of the netjeru of Kemet as real entities. Not as archetypes, not as forms of the God and Goddess (because there is no God/Lord and Goddess/Lady concept in Kemet, regardless of attempts to find one), not as anything other than what they are. There are some instances where netjeru are forms of others and other instances where they are expressed as extensions of the Creator netjer (whether this be Ra, Atum, Amun, Neith, Ptah, or others). However they are never regarded in this fashion.
Heka is not separate from the religion nor the religion from heka, so you cannot practice one and not the other. Regardless of attempts to do so, it stops being heka the moment you remove the religious context. This is something that has been brought up in the recent past by Ritner (alongside his colleagues) as they struggle to change how the Egyptologist community views the concept of heka. Heka is not supernatural. It is natural. It is a gift given to us by Ra to protect ourselves from the "terrors in the night" and "to be weapons that ward off the blow of events" (Ritner's Mechanics of Ancient Egyptian Magical Practices ).
There is very little determined to be "bad/evil magic", in fact the only recorded instance of it was when some hekau (magicians) turned against the Nisut-bity (pharaoh). This was considered truly evil because it fed isfet (the force of Uncreation which desires to plunge the world back into Uncreation) and destroyed ma'at. Whilst their are beings (and people) who are determined to be evil as they attempt to prevent the journey of the person into the afterlife, they are not condemned as evil persay, so much as they are condemned for preventing what is due to the person. They are condemned on account of the dead person, not on account of existence.
Anyone can practice magic to an extent. However, not everyone is a witch, nor is everyone a hekau.
As for Wicca and Voodoo, others have covered them.