The New Testament pattern for gathered worship seems to involve a meeting on the first day of the week—Sunday (e.g., Acts 20:7; 1 Cor. 16:2; Rev. 1:10). It involves the people of God coming together to enjoy the apostle’s teaching, fellowship, prayer, and the breaking of bread (Acts 2:42). Gathering with God’s people like this isn’t an optional add-on to following Christ. It is part and parcel of being a disciple. To neglect this is to deny the faith altogether. In fact, John describes apostates as those who stop gathering with God’s people:
“They went out from us, but they were not really of us; for if they had been of us, they would have remained with us; but they went out, in order that it might be shown that they all are not of us.” -1 John 2:19
In other words, faithfulness to Christ is not defined by personal piety alone. It is defined in part by persevering in and among God’s people in the church. To walk away from the church is to walk away from Christ. ~ Denny Burk
As J. Vernon McGee says: if your faith won’t get you to church it probably won’t get you to heaven.