Hi. Yes there seems to be resistance and a lot of rumors about Opus Dei.
I am a married member of Opus Dei and I heard these rumors too and ran across priests with opinions. I’ve never seen any weirdness or seen anything disturbing or wrong about what Opus Dei does or what members do.
I don’t think there’s anything really that “sets us apart”…in fact one aspect of the spirituality is to sort of “do and disappear” as St Joseph did.
We don’t hold organizational meetings or conferences, we don’t march as a group in pro-life marches, we don’t make banners, and we don’t have “Opus Dei views” on anything.
We see ourselves as a very small part of the Church with a mission to serve wherever we happen to be.
Most of our aposolates (there are a few schools in the US whose spiritual and doctrinal formation is overseen by Opus Dei) are quieter and are simply done wherever we are…at work, at home, in the neighborhood, at PTA meetings).
There are aspects of our spirit that at face value may seem quite ordinary and naturally part of the Catholic Church, but they sort of fuel and guide us.
“Divine filiation”: a deep and influential sense/knowledge of our filiation with God, God as Our Father. With God as our Father…what could we possibly be worried about! This leads to optimism, cheerfulness, glad service to Him and to the world, mostly though to the people He put us closest to…our wives, our children, our friends, our co-workers.
Sanctification of ordinary work: Turning back to God all created reality, giving everything the holy purpose that God intended for it. We strive to work very well humanly, in a spirit of happy sacrifice, doing the work with a holy intention (this task, my Father, is for my sins, for my cousin who has cancer, for peace in the world, for the Holy Father…etc.), and the work is done with the presence of and friendship with God.
Unity of Life: no separation of our spiritual life and our work life, or family life. No multiple personalities!! Always integrating our life with God, elevating all moments of our life to the order of grace, friendship with Our Father God.
Prayer and sacrifice: We strive to with God’s grace turn or convert all moments into conversational prayer. Practices of sacrifice, penance, done cheerfully in union with Jesus Christ. Keeping our senses and appetites on a tether, quietly, cheerfully, without anyone having to know that we are offering ourselves to God.
Charity: all work and time become an opportunity to serve, or acts of charity.
Hope this helps.