do you believe that God cares about how you worship him?
Yes.
should you kneel when you pray, should you be standing when you pray?
This question, as to whether we should kneel or rather make metanies while praying, or stand, is interestingly addressed by Canon XX of Nicaea, which is also sadly the single-most widely ignored canon of any ecumenical synod.
Should you receive Holy Communion Every time you gather
Only if one is properly disposed to receive it via fasting and preparation, and only if the liturgical service is a Divine Liturgy or Mass vs. a Divine Office service such as Vespers or Compline or another kind of sacramental service such as Holy Unction.
should you be baptised once or more than once?
According to the Nicene Creed we confess one baptism for the remission of sins, so as long as the first baptism was valid, made in the name of the Father, Son and Holy Ghost under conditions of correct belief, for example, not within Mormonism or certain other heretical sects (most of which do not use that term).
is it OK to dance while you're in church? is it OK to speak in tongues even if you had no idea what those tongues might mean and you don't know what you're saying?
In my view, these two activities are inconsistent wit the Pauline instruction that everything be done “decently and in order.”
Some people say the Ethiopians have liturgical dance … but if the backwards and forwards movement made by debteras during the Divine Office is dance, I should say the bar has been set so low that we might as well regard the Introit and Recessional in the Western mass or the Little Entrance and Great Entrance in the Orthodox Divine Liturgy as dance.
Really, when it comes to liturgy I am an arch-traditionalist, so I am uncomfortable if the liturgy we’re talking about can’t be traced back in some form to at least the 16th century (interestingly, the average age of the current recensions of most liturgical rites is about 500 years, not counting minor changes in the 19th and early 20th century such as the 1928 American BCP, 1928 Deposited Book and 1929 Scottish BCP,
Divino Afflatu or the Revised Julian Calendar combined with the
Violakis Typikon).
But just to use an ancient liturgy is not enough - we must worship beautifully. Our goal should be to evoke the reaction of the emissaries of St. Vladimir the Great at the Hagia Sophia in 1,000 AD: “We knew not whether we were on heaven or on Earth.” Because of liturgical beauty at Hagia Sophia, around 350 million people around the world including all Orthodox Christians of Russian, Ukrainian, Belarussian, Finnish, Latvian, Lithuanian, Estonian, Polish, Central Asian, Siberian, Native Alaskan, Japanese, Chinese, Korean, and North American backgrounds were saved, not counting those countries whose Christian populations were protected as a result of the Baptism of Kiev, such as the Christians of Georgia, Armenia, Bulgaria, Romania, Serbia and the Assyrians during WWI.*
*The Assyrians, including Suroye and Asuraya Christians of the Syriac Orthodox, Assyrian, Chaldean Catholic and Maronite churches survived the genocide in part through Czarist military assistance after the initial massacre in the
Sayfo in 1915 when around 90% of Assyrians living in Ottoman territory were brutally murdered as part of the genocide that also killed the majority of Armenians and resulted in the complete displacement of Pontic Greeks from Asia Minor, so that there are no Greek Orthodox churches left in places such as Ephesus, Bursa or Nicaea. Likewise such assistance was instrumental in the liberation of the Serbian, Bulgarian and Romanian Christians.
