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Or was Christ instituting the Sacrament of Holy Eucharist as Scripture attests, and the Apostles believed and the One Holy and Apostolic Church believes to this day?
Once you leave the Church so much is lost: The Sacraments, the Communion of Saints, One Holy and Apostolic Church… It is truly a great sorrowful loss.
Relevant to this discussion, what is also lost is your individual claim to decide what the Church believed and believes.
It is interesting that you did not mention how leaving the catholic church might affect ones relationship with Christ? I would think one might sense more of a loss of His fellowship if all the catholic church claims were indeed true.
Perhaps others who have left the church might better say if or not their relationship with Christ was lost or in fact was enlarged and better for leaving.
I say this because some people have a "need" to practice rituals....they might feel like a fish out of water without participating in these. So over time they very well might return in order to again 'feel significant' since practicing these rituals does fill otherwise voids in ones life....they do not know how to stand by faith alone.