There are many denominations of Christianity. Each has its own view on what constitutes proper worship. However, scripture says there is only one Lord, one faith, and one baptism (Ephesians 4:5). This indicates that there is only one true way to worship our God Yahweh. The most logical place to get information on how to properly worship would be The Bible. The Bible is a thorough work that completely enables a person set things straight in spiritual matters (2 Timothy 3:16-17).
True worship requires that we accept God's standards and reject all manmade doctrines (Matthew 15:9, Mark 7:6-8, Colossians 2:8). Everything we need to know is in the bible (2 Timothy 3:16-17), and anyone who teaches something beyond what is in the bible is to be cursed (Proverbs 30:5-6, Galatians 1:6-9). Some doctrines which are unbiblical are:
>Forbidding anyone to marry or to eat certain foods (1 Timothy 4:1-5)
True worship requires that we worship only the Father. The bible does not indicate that we are to give any kind of worship to anyone else (Exodus 20:2, Matthew 4:10, Revelation 19:10). There is no scriptural indication that we are even supposed to give an act of worship to Jesus. Elevating the status of any man is foolish (Psalms 118:8-9, Psalms 146:3, Proverbs 3:5, Romans 3:4)This would include Imams, Shamans, Lamas, Rabbis, Priests, and the Pope, among others.
True worship requires that we worship God with both spirit and truth (John 4:23-24). This means we must continually seek biblical truth in our worship, not just settling for what we're told (2 Corinthians 13:5, 1 Thessalonians 5:21, 1 Timothy 4:16), because we are supposed to be seeking truth (1 Timothy 4:15).
True worship requires positive changes in our behaviours. This includes, but is not limited to: Keeping our speech proper (James 1:26, Ephesians 4:31-32), taking on a newer, more godly, personality (Ephesians 4:20-24), looking after the needy and abused (Isaiah 1:17, James 1:27, 1 Thessalonians 5:14-15), cleansing ourselves of all fleshly defilements (this includes vices, bad hygeine, etc.) (2 Corinthians 7:1), and taking good care of our parents (Matthew 15:3-11).
True worship requires that we love all people and treat them as we would like to be treated (Matthew 7:12, 1 Corinthians 16:14, Galatians 5:14, Ephesians 5:1-2, Colossians 3:14).
True worship requires that we pray to Yahweh the Father (Matthew 6:6,9) through the Son, Jesus/Yeshua (John 14:13, John 15:16).
True worship requires that we live peaceably with everyone as far as possible, even our enemies (Matthew 5:43-48, Romans 12:18-21, 1 Corinthians 14:33, 1 Thessalonians 5:12-13).
True worship requires that we humbly submit to the earthly authorities as they are placed there by God Himself (Romans 13:1-7), so long as they don't ask us to do something that is against God's holy standards (Acts 5:27-29). (Notice, the former scripture points out that submission to earthly authorities includes paying our taxes, giving due honour, and to make sure we don't unduly oppose them. These things are not against God's standards. Now, something like bowing, kissing their hand, or honouring/saluting a statue of them - that would begin to be idolatry, so we need to be balanced in how we give honour. Proper ways to give honour would be: Obeying the common laws, paying your taxes on time, treating the leaders with dignity and respect, refraining from fraud against the governmental authorities, refraining from attempts to publicly humiliate them, things like that.)
True worship requires that we speak about God and His Kingdom to others, so they may have a chance to develop a relationship with Him (Matthew 28:19, Romans 10:12-15).
True worship requires that we be honest in all our dealings (Deuteronomy 16:19, 2 Chronicles 19:7, Proverbs 11:1, Proverbs 20:23, 1 Timothy 3:8, 1 Peter 5:2).
True worship requires that we continually seek accurate knowledge of God and His standards for worship (Psalms 105:4, Zephaniah 2:3, Luke 12:31).
Of course, this isn't intended to be a checklist to judge who the "good Christians" are. This is simply biblical guidelines intended to help individuals decide whether or not their own spiritual path is on a biblical course. It is better to leave the judging of "good Christians" and "bad Christians" to God and Christ. Let's only judge our individual selves, and make adjustments in our personal worship as needed.