I am seeking to fully understand the true difference between Assemblies of God and Church of God.
I assume you are referring to the Church of God denomination with headquarters in Cleveland, Tennessee, often referred to as Church of God (Cleveland, TN) to avoid confusion). They are both classical Pentecostal denominations. Assemblies of God is a non-Wesleyan or "Baptistic" type Pentecostal denomination. The Church of God is a Wesleyan or "Methodistic" type Pentecostal denomination. I'll explain the difference below, but first lets answer your questions.
These are my specific questions:
1) Do both believe in washing feet? If so, do they have differing beliefs regarding feet washing? If not, which one believes in it and which one does not?
It can be practiced in both denominations. As far as I am aware, it has no "official" status in the Assemblies of God. It is not mentioned in the Statement of Fundamental Truths. However, there is nothing forbidding an AG church from having a foot washing and I imagine that certain AG churches will do it at least occasionally. This article gives an example of how foot washing is used in the AG:
"Foot Washing Brings Down Ministry Barriers".
The practice is specifically mentioned in CoG doctrinal statements. See the denomination's
Declaration of Faith where you will see foot washing mentioned right beside the Lord's Supper.
2) I know AoG believes speaking in tongues is the INITAL evidence of infilling of HG. Does the Church of God also believe you have to speak in tongues to be filled? Or do they believe you can have the infilling without the tongues?
The CoG's Declaration of Faith (linked above) states: They believe "In speaking with other tongues as the Spirit gives utterance and that it is the initial evidence of the baptism of the Holy Ghost."
3) I have been to several AoG where women still wear dresses or skirts but cut their hair, wear makeup, etc. I have never been to a CoG where they wear skirts/dresses still. Is this an AoG thing or a case by case scenario?
Neither the AG or the CoG require women to wear dresses or grow their hair out. That is a personal choice. Some pastors/congregations may be more conservative than others in this regard. If anything, you would see this more often in the CoG if anywhere, but in general both the AG and CoG have moved away from this type of dress code as markers of holiness.
4) are there any other differences that are significant?
The only major doctrinal difference is that the CoG is a Wesleyan denomination. This means they believe that it is possible to achieve "entire sanctification". This is an experience that occurs after salvation but before Spirit baptism in which the person is enabled, by faith, to achieve a greater degree of holiness of life. This new holiness or "clean heart" then prepares one to be "filled" with the Spirit in Spirit baptism. Their Declaration of Faith states that they believe:
- In sanctification subsequent to the new birth, through faith in the blood of Christ; through the Word, and by the Holy Ghost.
- Holiness to be God's standard of living for His people.
- In the baptism with the Holy Ghost subsequent to a clean heart.
The Assemblies of God, however, rejects this Wesleyan notion of "entire sanctification." Their
Statement of Fundamental Truths states the following:
Sanctification is realized in the believer by recognizing his identification with Christ in His death and resurrection, and by the faith reckoning daily upon the fact of that union, and by offering every faculty continually to the dominion of the Holy Spirit.
For the AG, sanctification is a progressive (continual) action of the Holy Spirit. It is a process, not an event. While the CoG also recognizes that sanctification is a process, they also believe in an event in the life of the believer that is necessary for us to achieve greater holiness in this life. This is called "entire sanctification."
To simplify, the AG is a 2-stage denomination: you get saved, then you get the baptism in the Holy Spirit. The CoG is a 3-stage denomination: you get saved, then you get "sanctified", and then you get baptized in the Holy Spirit.
What is the diff between Church of God and Church of God of Prophecy?
The Church of God of Prophecy started as a split within the Church of God. They basically believe the same thing, they just had a fight over who should be in charge. Basically. It happened a long time ago. The two denominations are pretty friendly today.