Joshua 1:7-9 - "Be strong and very courageous. Be careful to obey all the law my servant Moses gave you; do not turn from it to the right or to the left, that you may be successful wherever you go. Do not let this Book of the Law depart from your mouth; meditate on it day and night, so that you may be careful to do everything written in it. Then you will be prosperous and successful. Have I not commanded you? Be strong and courageous. Do not be terrified; do not be discouraged, for the LORD your God will be with you wherever you go."
First point, God tells us to obey His law. There is no doubt the ELCA is not doing this. (read here) The question is if we will follow and support the ELCA's willful and remorseless disobedience to God or not.
Second point, God says He will take care of us when we strongly and courageously follow Him. God reveals to us His will in scripture. We do not need to fear. Doing what God wants is priority number one.
Note, we can also conclude from the above scripture that God does not promise our church that He will be with us or prosper us if we willfully go against His law.
Will we follow God? Here is how Joshua said it, "But if serving the LORD seems undesirable to you, then choose for yourselves this day whom you will serve, whether the gods your forefathers served beyond the River, or the gods of the Amorites, in whose land you are living. But as for me and my household, we will serve the LORD." Joshua 24:15
Staying in the ELCA when you know that the denomination has departed from the Good News and scripture is like serving the LORD but still attending the "gods of the Amorites" religious ceremonies. Joshua does not list that as an option.
Choose for yourselves this day whom you will serve.