What is christianity?

is a wholly subjective relationship between God and the individual which cannot be defined, dictated, described or directed by anyone but God through Christ by the Holy Spirit.
Organized religion has absolutely no authority, power, efficacy or right to insert itself, its doctrines, practices, or demands anywhere into this sacred subjective relationship.
The purpose of the modern "brick and mortar" church has a simple three-fold purpose: To serve emancipated believers by freely teaching the Word of God contextually and without bias, To support and encourage individual believers in their respective walk with Christ, and to share the Lord Jesus Christ with other people who have yet to receive Him by faith.
For all to consider:
Christians are saved by grace through faith to love by suffering as Christ.