In Heb. 10:24-25 the writer instructs those who were tempted to stop gathering together, most likely due to fear of persecution, not to forsake this practice. I must say this was me personally before I was saved. I believed in "God" but could not stand the idea of church for popular reasons such as hypocrisy and money scams. But now you can't keep me out, it's the highlight of the week! No this doesn't save us and as we read in Paul's letters we are not bound to days and festivals. (Rom. 14:5-6, Col. 2:16), but we do deprive ourselves and others of a real blessing by not gathering together.
This idea of I don't need church implies Jesus made a mistake by establishing His church and in hating or forsaking His body we turn our back on Him. When Paul was converted Jesus said why "are you persecuting ME" We can't disassociate Jesus from the church. Jesus commanded us to love others as ourselves (Mt. 22:37-39) as well as practice the "one another's" which is done first within the church then in the community. I prepared a sermon on this very topic and said the church has 3 purposes; 1( Exult Jesus, 2) Edify each other, 3) Evangelize the lost. Can we do that on our own? Yes and No. There is something special about corporate worship when we sing and pray and learn the word together which we can't receive on our own. Our gathering is the place where we weep, rejoice, cry, laugh, and form relationships which challenge us to grow into Christ. When we use our spiritual gifts and put our resources together we have a greater impact for the Kingdom of God compared to if we were lone rangers.
This makes me think of the O.T. story of David in (1 Sam. 21:1-9) when he runs into the tabernacle and takes 2 things the Bread of Presence and Goliath's sword. This is what church should provide bread for the journey and a sword for the fight! The word of God is likened both to bread as well as a sword. (Mt. 4:4, Eph. 6:17) When our congregation leaves they should be equipped for the battle which is waging in the world. So, yes I need church! I will always remember reading the words of Rick Warren that spurred me to get back to church when he said "the person who says they don't need church is either ignorant or arrogant." I,m so blessed I came home!