Sadly some might be, and no you don't just turn up and pay your 10% tithe, and expect to get to heaven. There's more to getting to heaven and being added to the Lambs book of life.
The Father knows our heart, you don't get in by works, but by your heart, your Love, and if you walk in the Kingdom of God.
Like any other organization, they need money to survive, most churches use some of this money for area's such as, outreach where they go out into the community and offer assistance.
Missions, to other countries that are in desperate need of orphanages, schools etc. And in the process spiritual help and healing and deliverance.
Hope that helps