That is so sweet of you to post this. I can't imagine you offended anyone. For example, since I'm not jewish I don't celebrate Rosh Hashanah but if someone sent me a Happy Rosh Hashanah message I would just be happy that they thought about me at all and since that would tell me that they probably are observing Rosh Hashanah, I would send them a happy Rosh Hashanah message right back.
For the record, I love Halloween so consider this an open invitation to my profile.
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"If you have men who will exclude any of God’s creatures from the shelter of compassion and pity, you will have men who will deal likewise with their fellow men." — St. Francis of Assisi, 1181-1226