Sabbath

Been trying to figure out the sabbath day. There’s people saying we enter into Gods sabbath when we receive the Holy Spirit and there’s other people thinking we keep the Saturday Sabbath still. As of right now I’m thinking we do both; the SDA church believe the Sunday sabbath by law is the mark of the beast. If we don’t do the Saturday sabbath and don’t feel conviction do we have the Holy Spirit? And then are we really saved? Just want to hear people’s opinions on the sabbath.