The excuses are certainly a lot when someone DOES NOT WANT to live according to how the Church says. Unfortunately these people consider themselves outside the Church since they do not accept the basic components of the life in Christ, which is the participation of a Christian in the Mysteries of the Church. These people are not Christians, at least not Orthodox, because while they (supposedly) believe, they do not follow any word of Christ.
The issue of course is that most baptized Christians do not know who Christ is or what the Church is, and what Christ and the Church offer to people. Thus they do not attend church, because essentially they do not know what they are missing, and they do not know what the sacramental life can offer.
The Church, with all Her Mysteries, transforms us, sanctifies us, and brings us into communion with God. Our participation in the Mysteries of the Church is the key to this personal resurrection of ours.
The Church does not exist merely to take the position of medicine and exhaust all its capabilities, as some wrongly treat it. The Church exists to lead people, the faithful, to the Love, the Light and the Life in Christ through the Mysteries.
To say you believe in God is easy, but to believe in God in an Orthodox manner and to do corresponding works is difficult, though not impossible.
If a person really wants to know Christ, they can do this through the sacramental life offered by the Church. If you want to fool yourself you can claim to achieve this on your own. However, I do not know anyone that has been sanctified outside the Church. (The crazy thing is that some people consider as saints people like Elder Paisios, Elder Porphyrios, etc., yet they do not accept their lives. Twisted people!)