I was a Roman Catholic, but never felt connected to the church. I went through the motions, but it just never felt right and I didn't truly believe. I stopped going and spent some years attempting to be an atheist, but there was always that pull towards God.
My son started going to Orthodox Church and I decided to visit out of curiosity. All I can say is that I was blown away and everything just fell into place over the course of the next few weeks and months. I found the Liturgy (St John Chrysostom) and prayers spoke to me in a way I'd just never known possible. It was like falling in love. I had finally realised and accepted Christ. I was Chrismated and have been going ever since.
Differences to RC church:
The Orthodox Church is the original Apostolic Church, but the RC church interpreted The Trinity in a different way. Google the filioque for an explanation. It may seem like a tiny difference, but it actually brings a hierarchical structure to The Trinity which isn't meant to be there and upsets the balance. The Orthodox Church doesn't accept this and the two churches went their separate ways in 1054 officially.
The RC church also introduced the doctrine of the immaculate conception (regarding Mary's conception, not Christ's), Mary as co redemptrix, papal primacy, salvation, original sin and grace are interpreted differently as well.
The Orthodox Church teaches that salvation is an ongoing process with the individual growing closer to God as time passes. This takes prayer and work through fasting and helping others. The Orthodox Church is described as a 'hospital for the soul'. There is no feeling of RC guilt going on. The RC church focuses on the crucifixion of Christ, whereas we focus on The Resurrection. Our Church accepts mysticism in that we don't try to analyse what God is or how He works etc. We accept it as a mystery. This has been good for me, because I did used to overthink and analyse my beliefs and I found it an intolerable burden. I feel that Christ has removed this unhappy burden through His Church. We believe in the literal existence of evil and demons. Satan is a real entity, not a Hollywood invention. We have to be on the guard for these elements and realise that we can be tempted and attacked.
Our Divine Liturgy dates back to the 4th century. We pay close attention to the Church Fathers and their teachings and also our Saints. We Venerate the icons of Christ, The Holy Mother and the Saints and Orthodox homes have a collection of icons. They feel like my family members when I pass them. We say morning and evening prayers in front of them in the home. We also light candles and have some incense.
The main Orthodox Churches you will find in the UK are Russian, Romanian, Greek and perhaps Serbian. There are also ROCOR churches - that is, Russian Orthodox Church Outside Russia. Our services are all in English. The other Orthodox Churches will often conduct some of their services in English, but you'd have to check. Each Church has its own style and tradition of hymns, but we all follow the same Liturgy, prayers etc. We don't use instruments in Church and hymns are sung by a choir.
There are other types of Orthodox church such as Antiochian, Coptic and Oriental, but they have different beliefs regarding Christ and the EO Church aren't in communion with them.
We have traditional beliefs regarding marriage and family life. Divorce is allowed if necessary. Priests and Deacons have to be married before they are ordained unless they're a monk and then they become priest monks.
Obviously I'm in favour of a person becoming Orthodox rather than RC, but it's a personal for everyone seeking. Obviously, the Orthodox believe that you will find salvation in our Church because we have 'right belief' that comes directly from the Church that Christ established on earth.
Do try to attend an Orthodox Liturgy if you can. They are very different from RC services.
I hope this has helped a bit.