There are today many denomination and non-denominational churches that are at the core Historic Christianity. What I mean is they will all agree on the Major Doctrinal issues although, they will disagree on minor Doctrines. There are doctrines that are emphasized more than others in the Bible. Keep in mind there are no denominations in heaven only believers in the Lord Jesus Christ! (1 Cor. chapter 12) We do not need to be a theologian to go to heaven!     
           These are the Major Doctrines:
All Cults will deny one or more of the following doctrines to be true. Added to this they will often deny that Hell is a real place of torment. Also they often claim to be the only true church.  Major doctrinal issues would be things such as:
1. The authority of the Bible. 2 Tim.3:16, Is.40:7-8
2. The belief in only one true and living God. Is.44:8, Deut.5:7
3. The deity of Jesus Christ. (Jesus is fully God and Man) Jn.1:1&14, Phil.2:5-8, Jn.8:24
4. The bodily resurrection of Jesus Christ. Ps.16:10, Jn.2:19-22, 1 Cor.15:1-4
5. Salvation by grace apart from works. Eph.2:8-9, Rom.4:4-5, 11:6
           These are the essentials of the gospel message and Historic Christian Doctrine. They cannot only be shown clearly in the Bible, but in the writings of the Early Church Fathers, as well. Someone who does not believe these essentials should carefully examine the scriptures because they do not believe the gospel taught in the Bible. There are warnings for accepting a false Christ or gospel. Gal.1:6-9,Mt.24:5&11, Prov.16:25
          There are many non-denominational churches and many Community Churches that teach these truths. There are also many mainline denominations that believe these truths. I will name just a few of these, Assembly of God, Calvary Church, Baptist, Pentecostal, Lutheran, 7th Day Adventist, Foursquare and Nazarene. These are all Christian churches that may disagree on the minor doctrines. Yet they can still fellowship with one another because they believe the same major doctrines and worship the same God.
There are many denominations that do not believe these essential truths and are considered Cults. I will also name just a few of these, The Church of Jesus Christ of Latter Day Saints (Mormons), Kingdom Hall (Jehovah Witnesses), Baha'i World Faith, Christian Science, Scientology (L. Ron Hubbard), The Unification Church, Unity School of Christianity and The Way International. You can write for more information on any of these. You can probably also find information on them under Cults in your local Christian Bookstore.   
Minor doctrinal issues would be such things as:
1. Is the gift of tongues for today?
2. Can a Christian eat meat?
3. Will the church be raptured before, during or after the tribulation?
4. Is Saturday or Sunday the day we should worship?
These are minor doctrines because no matter what you believe on these issues, it does not affect your salvation. In other words you can still be a Christian and go to heaven no matter which side you take. These are not the essentials of the Gospel message.