Many of my clients who are discovering the world of Angels and the metaphysical, report that they are living a double life.
They can speak their beliefs to a small, select group, but when around family or co-workers, they have to "play along," and pretend to share the beliefs of that group or be shunned or drawn into an unpleasant argument.
The beautiful thing about the Angels, is that they do not demand that you acknowledge them in public. They are happier to have your one-on-one attention and even happier when you ask for their help.
As Angels are a part of many religious traditions, you can focus on what you have in common while avoiding subjects that start fights.
Focus on the love, friendship or appreciation you have for the person and let go of the difference of opinion.
In the end your spiritual path is one that you walk for your own growth and development. If you can't "agree to disagree," then chose to be silent and know that all is well.