Christianity is a practice, not a theory. Therefore, any objections to it on the level of theory have to be relevant on the level of practice.
For example, I might object to the pacifist philosophy on which aikido is based, and have what I think are knock-down arguments against them. Yet, in the end my objections have to effect the practice of aikido, to be an objection to aikido.
Jesus was very light on theory, and rather all about action, and modern day practitioners of Christianity should heed that – it’s very easy for egg-heads to cause more damage than harm, often through unintended side-effects of their proposed theoretical solution.