Christianity as an organization of political power is a horrible stain on humanity and likely always will be.
Christianity as a personal or small community religion is actually a really beautiful and hopeful thing. Christianity does not start and end with the old testament, it ends with an overcoming of many of the regressive messages within the old testament and strong recurring themes of hope based around community. The bible is a pretty important world text and has a lot of great messages in it.
Basically, attack systemic issues and organizations rather than individual beliefs.