Worship is a privilege only children of God have. There are many blessings we receive from faithful attendance in worship. God has commanded us to assemble regularly to worship Him in spirit and in truth (John 4:24). Hebrews 10:25-27 says, "Not forsaking the assembling of ourselves together, as is the manner of some, but exhorting one another, and so much the more as you see the day approaching. For if we sin willfully after we have received the knowledge of the truth, there no longer remains a sacrifice for sins, but a certain fearful expectation of judgment, and fiery indignation." When we forsake the assembly of the church, except for sickness or circumstances beyond our control, we are not only disobeying God, but we are robbing ourselves of all the benefits of worship which would have helped us to grow and become spiritually strong. To forsake worship is to sin willfully.
By forsaking the assembly, we also endanger our souls because as the above verse says, "For if we sin willfully after we have received the knowledge of the truth, there no longer remains a sacrifice for our sins." Christ is our only sacrifice for sin. When people reject their only sacrifice for sin there remains nothing but "a certain fearful expectation of judgment and fiery indignation."
When people fall away from the Lord, it is usually not a sudden thing. They usually start by forsaking the assembly of Wednesday night Bible study. Then they start missing Sunday evening worship. Next they stop coming to Sunday morning Bible study; and then finally they stop coming to Sunday morning worship. This is the usual path of apostasy for most people who fall away. Oh, some may come back and "visit" several times a year and a few may even attend only the Sunday morning worship with little regularity. These are described in 2 Peter 2:22 as, "A dog turns to his own vomit again, and a sow that was washed to her wallowing in the mire." Some members have turned to their own vomit and are in the pigpen and they can no longer smell the stench. Let’s not lose our souls by unfaithfulness.