A person could become a Christian but die before they can be baptised, or receive communion. They would still be saved.
That is called the Baptism of Desire, or in the case of the Baptism of Blood. It is inadvisable to delay baptism relying on that, especially for an adult (I don’t believe children will be penalized by their parents refusing to baptize them due to the errors of the Credobaptist movement opposed by our friends
@Ain't Zwinglian @ViaCrucis and
@Jipsah with such eloquence, but for an adult to delay baptism seems to contradict the Nicene Creed. Even the Quakers who did not engage in physical baptism believed they were being baptized spiritually and connected it to an ecclesiastical context.
Intentionally avoiding baptism or delaying it was a common vice in the early church due to a belief that one would not be forgiven for sins committed after baptism, which even affected Emperor Constantine, but it is clearly wrong, and it is rejected now for the same reason it was rejected then.
The person who has not received Baptism has not received the sacramental grace and has not been born again of water
and the spirit. Baptism enables one to safely partake of the Eucharist and will also remove any demons that might be oppressing someone (in a liturgical church at least, since we include a prayer of exorcism in the liturgy).
I would also note that baptism like the Eucharist is extremely enjoyable, and is an example not of an unpleasant ritual but of Christ dispensing his grace to us in a way that gives us pleasure now and delivers us from death in the future. The sacraments, when done properly, are not drab rituals but are means of accessing a joy that is beyond description.
In my childhood, I was blessed to receive the Eucharist for the first time around age four (had I been an Orthodox I would have received it from infancy). I remember being amazed by how delicious it was I attempted at home to recreate the taste using the exact same bread and juice without success. I later discovered that even in rites where the Eucharist is formulated with slightly different matter, for example unleavened bread in the case of the Roman church or in the case of the Orthodox, our liturgical rites which usually use fermented bread except for the Armenian Apostolic Church among the Orientals, the surreal taste is still the same - it is because I am not consuming ordinary bread and wine, but the very Body and Blood of Christ our God.
Thus, what I don’t understand about the anti-sacramental position is why people would object to doing what is both scripturally commanded by Christ of all Christians in the case of Baptism and the Eucharist (with limited exceptions for those unable to be baptized before dying, for example of martyrdom), and which is at least in the liturgical churches, extremely pleasurable.
What is the logic of “Oh, let’s not spend an hour or two listening to the most beautiful music with the most beautiful words ever written before experiencing pleasure given by God as a gift directly analogous to the nuptial bliss of Holy Matrimony”? It baffles me that anyone would wish to deprive themselves from that.