It is totally Biblical for a person to be against obedience to God as the source of the gift of salvation
(Eph 2:8-9).
It is not Biblical to be against obedience as the result of the gift of saving faith, in the process of sanctification by the Holy Spirit.
Likewise, those in the New Covenant are not under the OT Mosaic regulations.
They are under the New Covenant Law of Christ (Mt 22:37-40; 1Co 9:20-21; Gal 6:2; Jas 2:8;
Ro 13: 8, 9, 10).