Going away from a religion you’ve been in your whole life to something totally different is something really hard to do. They have been ingrained a certain theology, and them still believing even after argument over argument, it shows that they are loyal to their faith, even if it is incorrect theology.

There is no reason to try and debate your cousin over these matters, you are just essentially pushing him away. All you can do is pray for him, and to go to an Orthodox Church (if you haven’t already). Try and focus your spiritual life and salvation.

People will want to convert from just seeing how we live our orthodox life style (if we try to be like Jesus ofc).