Honestly, the only church I’ve encountered that has the “attend church under penalty of serious sin” is the CC (and EO). Protestant churches, like Methodist or Baptist, will of course promote regular attendance because it is considered edifying for the believer.
Episcopal churches, such as the one I attend, encourage regular attendance to maintain spiritual health and balance, by receiving the Eucharist, and to connect with the church community.
But if one wants to take a weekend and go fishing, they are not going to be held accountable to find a service somewhere to avoid missing. It’s not considered so much a sin to miss Sunday Liturgy. Though if one were to miss services chronically, that will invite some frowning and sardonic commentary from the junior warden in my church, lol.