It really doesn't surprise me what the elder said to you. They are taught to protect the org. at all costs. I live in the UK where the policy is to report it to the police.
I don't see that scriptually it matters if you live in a non reporting state. It is always going to be wrong to cover up serious sins or crime in a congregation.
I totally agree with the others, get out and seperate yourself from these people. It is clearly not a religion that God approves of.