Metal roofing does not increase the risk of a lightning strike. Lightning is typically attracted to the highest point in an area, not to specific materials. The presence of a metal roof doesn’t make a structure more likely to be struck. In fact, if lightning does strike, metal roofing is non-combustible and can help safely dissipate the energy—making it a safer option in that rare event.
It’s also worth noting that lightning protection is not a requirement in building codes for standard residential construction.