Is it true that the Southern Baptist denomination marks no distinction between member and non-member, Christian or non-Christian, in that everyone is encouraged to participate in the events (sitting in the sanctuary during worship service, engaging in Bible Study groups, participating in charities, going to Sunday school, donating money to charity programs, etc.)? Or does this behavior vary from congregation to congregation (since the entire denomination operates on a congregational level by direct democracy), where some congregations may be more open to outsiders and some congregations may only reserve activities for believers or for members only, but the only difference between a member and non-member is that the member is allowed to vote and assume leadership? So, a person can be a regular churchgoer, hearing the sermons every week and sending the children to Sunday school, and not really become a member or become baptized until the person chooses to assume leadership in the church community?

I suspect that it all boils down to the Baptist belief that baptism is the outward sign of inward conversion. Therefore, a person may choose to remain unbaptized or not officially become a member, unless the person wants to assume leadership roles, such as deacon.