"Every good and perfect gift is from above." James 1:17a
Giving is a privilege. It's the greatest investment we can make because it reaps an eternal dividend. God has blessed us with all that we have and throughout scripture, we are reminded of the importance of giving back a portion of what God has provided. His Word says that giving is an act of worship that should be done with a spirit of gratitude.
Malachi 10 - 12 “ ‘Bring the whole tithe into the storehouse that there may be food in my house. Test me in this,” says the LORD Almighty, “and see if I will not throw open the floodgates of heaven and pour out so much blessing that there will not be room enough to store it. I will prevent pests from devouring your crops, and the vines in your fields will not drop their fruit before it is ripe,” says the LORD Almighty. “Then all the nations will call you blessed, for yours will be a delightful land,” says the LORD Almighty.”
The word ‘storehouse’ can be translated into the local community of faith to which believers are connected, in our case NCC. In essence, we are to bring the Lord's tithe (10% of our income - Leviticus 27:30, 32) to the "storehouse" from which we are spiritually fed so that particular place is able to keep producing the spiritual food and benefit for which we love to attend.
If believers at any given church do not do their part and honor the Lord's tithe to that church, then they're hurting themselves and their own church. It’s to everyone's blessing and benefit that we give the Lord's tithe to our church so God can use those tithes to advance His kingdom through that church.
If NCC is your local storehouse, then based on Scripture, we encourage you to give the Lord's Tithe/10% to NCC according to your convictions.
That said, in Acts 2:42-47, believers gave to other believers as each had need. They didn't base it on 10% as much as kindness from the Holy Spirit, which was often WAY above 10%! The Church is the Lord's, and He knows who gives plenty, where, when, etc. So in the end, we leave it to Him to direct hearts, and we leave it to you to follow His leading according to His Word.
If you wish to give money to other Christian organizations, then that is also your freedom of choice. Offerings can be given to your local community of faith/NCC through special ministries & missions, or other places that glorify Jesus' name. These gifts are usually above and beyond the 10% tithe.