I have been to one -- and sorry to say, I feel the "two miles wide and one inch deep" comment is accurate. The theology often was shallow. I also felt that the megachurch's marketing strategy was to loot smaller churches of the same denomination rather than to enlarge the circle of believers.
I also indicated that my experience may not be typical -- so I am open to other views on the topic.
I doubt your megachurch had positions on the following issues:
1)Christ's kingship, priesthood etc.
2)How Christ fulfilled his role as the Second Adam
3)How salvation occurs....the process...soteriology
4)Probably avoided eschatology as well since there is wide disagrement here
5)A complete doctrine of sin
6)Complete doctrine on the work and function of the Holy Spirit.
THIS is the problem with megachurches. They don't know WHAT THE HECK THEY BELIEVE.
Sure, they have some brief statement of faith that is so vague that anybody could assent to it.
For example, here is Central Christian Church's statement of faith (a Wichita megachurch). This is the only statement of belief they have.
"We Believe the Bible to be the only inspired, infallible, and authoritative Word of God.
We Believe there is one God, eternally existent in three persons: Father, Son, and Holy Spirit.
We Believe in the deity of our Lord Jesus Christ, His virgin birth, sinless life, miracles, atoning death on the cross, bodily resurrection, bodily ascension into heaven, and His personal return once again in power and glory.
We Believe that for the salvation of lost and sinful man, regeneration by the Holy Spirit is absolutely essential. That salvation cannot be gained by human effort, but only through God's grace in the redemption He provided in Jesus Christ, a redemption which is responded to by faith and which leads to a life devoted to obeying God.
We Believe that repentant believers in Christ should be baptized in water, by immersion (the Biblical form of baptism), in obedience to Christ.
We Believe in the present ministry of the Holy Spirit by whose indwelling the Christian is enabled to live a godly life.
We Believe in the resurrection of both the saved and the lost: they that are saved unto the resurrection of life and they that are lost unto the resurrection of damnation.
We Believe that, because all believers are spiritually united in the Lord Jesus Christ, we should cooperate in all possible ways in God's work with our fellow believers, both those among us and elsewhere, loving and being patient with one another in our differences."
What a weak statement. No real doctrine of eschatology, just basic prattle anybody can assent to from Catholic to Methodist to Baptist to Charismatic. Ironically, the only statement in which Central has any balls at all to take a hard stand is on the mode of baptism.
THIS IS WHY MEGACHURCHES ARE A PROBLEM.
It is not the size of the church...the size is an awesome testimony fo the power of God. The problem is that these churches are churning IGNORANT, know-nothing Christians.
The devil is a crafty SOB, and WE NEED TO KNOW AS MUCH AS WE CAN about ***what Christianity teaches and why*** in order to DISCERN his temptations and leadings to false doctrine.
If all we have is a pathetic little statement like Central's, we WILL be led into false doctrine. We WILL be led into sin. And the devil will have his way with us all the while we don't know it.