Now the Catholic and Orthodox churchs' obsession over artifacts makes sense... due to confusion over time and/or spotty record keeping, almost any ancient relic could be the REAL phylactery of Jesus, and therefore all of these objects are treated with the utmost care, even to the point of worship.
Conveniently, the symbol of worship is the Cross, and is so widespread that any cross could possibly be his phylactery. Hot Damn that's a lot of Horcruxes.
Genocide as the only method of killing a lich? HOLY FUCK YES.