Indeed it is.
Can. 1247 On Sundays and other holydays of obligation, the faithful are obliged to assist at Mass. They are also to abstain from such work or business that would inhibit the worship to be given to God, the joy proper to the Lord's Day, or the due relaxation of mind and body.
2181 The Sunday Eucharist is the foundation and confirmation of all Christian practice. For this reason the faithful are obliged to participate in the Eucharist on days of obligation, unless excused for a serious reason (for example, illness, the care of infants) or dispensed by their own pastor.119 Those who deliberately fail in this obligation commit a grave sin.
With all due respect, that’s Catholic stuff, not Christian stuff.
As far as I know, the most the bible gets into it is “do not forsake the gathering together of yourselves.
The Christian experience is so personal (between the Christian and God) that any get together of humans that are Christian is kinda like a family reunion more than anything else. And most definitely not a “requirement”.
This includes “going to church”.