Your assumptions are wrong...
Religion does not share the perspective that it is a rational compendium of beliefs. It is not rational.
Rationality has the real say in discounting beliefs.
The problem is that irrationality is so ingrained within the religious community that it is nearly impossibly to reason with them...
Here - try a few:
1. Why does prayer fail so abjectly… Why does God never heal amputees?
2. How can you say acceptance of the sacrifice of Jesus is entirely voluntary when rejection imposes a mandatory, eternal, horrific punishment? Rather it is ultimate coercion.
3. How do you square the words of Jesus (Matthew 5:17-18; also, Luke 16:17) “Think not that I am come to destroy the law, or the prophets: I am not come to destroy, but to fulfill. For verily I say unto you, Till heaven and earth pass, one jot or one tittle shall in no wise pass from the law, till all be fulfilled.” with the “law” as practiced by the modern church? By obeying only certain portions of the Law – are you not risking ignoring a key provision of the Law that God doesn’t want discarded and thereby condemn an entire congregation to eternal hell? You either get it right or burn in hell forever?
4 Is there a “cherry picking” instruction in the bible? Are there “cherry picking” guidelines in the bible? If not then why not have slavery? How do you “cherry pick” the Bible and, yet, still consider it a divinely inspired, inerrant text? How can you NOT cherry pick the Bible, to remove evil commandments from God, even though by doing so the foundation of the Bible and of Christianity is undermined?