Your friend and you are wrong. It is actually spelled out in the Soul Reaver manual how vampires are made. Raziel even talks about it when you go to fight the first boss.
But as I pointed out here: There seem to be many different ways of making vampires. Some unkown method that the original vampire race (like Janos) created others (like Vorador). Some method that Mortanius used by placing the Heart of Darkness into Kain's corpse. The method Kain (and presumably every vampire after him) used which reanimated a corpse using a portion of the parent vampire's soul. Kain created the lieutenants and they in kind created their faction/guilds/whatever.
Nicholas Watson
'Lady Yupiel's Servant' by Nanashi
Zachary Sanders
Don't forget theres a /sequel/ monster was super hyped for it
Aiden Davis
Let me guess, it sucks(no pun intended).
Jason Foster
It was actually really good, but it kind of sort of had pet play which was a bit of a turn off for a lot of people
Parker Sanchez
...
Cameron Taylor
Why does this have to happen?
Grayson Reed
What people? /monster/? Same people that loves to be raped and dominated?
Lincoln Young
Have you been there in the past fucking year, m8? It's all vanilla "i wanna hold mai waifu's hand and pat her head!" trash there now. Harems are just about verboten and the mods do nothing to stop the shitposting that comes with someone being into something other than monogamous vanilla.