I asked a related question yesterday. (I'm not sure if it's a duplicate as the emphasis is quite different)
I'd like to pray Salat at the mosque tomorrow, as I think it is a great way to worship and pray to God, but I'm worried that doing so might signify a total acceptance of Islam's teachings and (more concerning) an implicit denial of Catholicism. What is the muslim perspective on this situation? Would it be a denial of my existing faith to participate in Salat?
In Catholicism we have the Eucharist, and if you participate in the Eucharist you are making a non-verbal statement that you agree with all the Church's teachings. Hence it would be inappropriate for a non-Catholic to join in. Is it similar with the Salat?
A related way of phrasing the question: I believe in all the Christian doctrines such as the incarnation and the trinity at the same time as believing in the oneness of God. Would it therefore be inappropriate for me to participate in Salat?