While it is true that Jesus is present everywhere in his divinity, in his humanity he is only substantially present on earth in the Holy Eucharist.
This is why praying before the Eucharist is so important, and why Mass is so necessary. The humanity of this same Jesus who is present in all places as God, is really truly and substantially present on earth only in the Sacrament of the Altar.
We can come to God in the mountains or in our home, but to divorce God from the Eucharist would be to approach the divinity apart from the humanity of Christ -- but it is through Jesus that "God saves".
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