A believer will never reach full spiritual maturity without the assistance and encouragement of other believers (the body).
1 Corinthians 12:21-26teaches us, “The eye cannot say to the hand, “I don’t need you!” And the head cannot say to the feet, “I don’t need you!” On the contrary, those parts of the body that seem to be weaker are indispensable, and the parts that we think are less honorable we treat with special honor. And the parts that are unpresentable are treated with special modesty, while our presentable parts need no special treatment. But God has put the body together, giving greater honor to the parts that lacked it, so that there should be no division in the body, but that its parts should have equal concern for each other. If one part suffers, every part suffers with it; if one part is honored, every part rejoices with it.”
Going to church and being around other believers doesn’t make you a Christian. If you are a true believer in Jesus Christ, you will want to go to church and have a desire to be around other believers on a regular basis.
What is your part in "the body"? Are you active or atrophied?