Yes, I do practice speaking in tongues. You, apparently, don't.
How can you be certain if you don't know what it is?
I know that speaking in tongues is a language of men or of angels.
We could engage in endless speculation but what does the bible teach?
The Bible teaches that God would like all Christians to speak in tongues. That when people speak in tongues they are speaking a language of men or of angels, that people do not understand what they are saying, that speaking in tongues is magnifying God, giving thanks well, and more.
Never are we given an example of angelic tongues
Please see 1 Cor 13:1.
and the one instance where we have more than just the sign value of tongues it is at Pentecost and the Holy Spirit spoke to everyone present in their languages. Does that happen today?
The apostles spoke in tongues, and the languages they spoke were understood by those present. That does not generally happen today, but occasionally it does. And the fact that it does not generally happen today is the reason God tells us that when a person speaks in tongues he must interpret.
How convenient. You miss the instruction by a mile.
Accusation is one thing. Why don't you try explaining how I missed it?
There is no instruction to speak tongues privately.
1 Cor 14:
28) But if there be no interpreter, let him keep silence in the church; and let him speak to himself, and to God.
Not one example given in scripture the whole concept is foreign to the teachings of Christ.
There is an example above, and the Christian new birth was not available until the day of Pentecost. It was part of God's secret (KJV mystery) (Eph 3:2ff). The details were given to the apostle Paul by revelation, and he wrote them down as scripture.
Jesus came to openly declare the kingdom of God not create drama and mystery.
Agreed!
Are there any divine mysteries that God needs revealed to Him?
No, God knows everything.
If you don't know them then they are of no profit to you.
I take the scriptures for what they say:
1 Cor 14:
2) For he that speaketh in an [unknown] tongue speaketh not unto men, but unto God: for no man understandeth [him]; howbeit in the spirit he speaketh mysteries [musterion, divine secrets].
4) He that speaketh in an [unknown] tongue edifieth himself; but he that prophesieth edifieth the church.
Our commission it to tell others of how Christ has saved us and that He will save them as well if they confess their sin and receive Him as Savior.
Agreed.
Rom 10:
9) That if thou shalt confess with thy mouth the Lord Jesus, and shalt believe in thine heart that God hath raised him from the dead, thou shalt be saved.
10) For with the heart man believeth unto righteousness; and with the mouth confession is made unto salvation.
You have been enticed by mysticism and wandered from the path that leads into righteousness.
Speaking in tongues is not mysticism, it is something God wants us to do. The gift of the Holy Spirit residing in us is not mysticism, it is the power of God. The other manifestations of the gift of the Holy Spirit are not mysticism, they are the power that God wants us to use to benefit the body of Christ.
The path that leads to righteousness is to learn the gospel, believe on Jesus Christ, and follow Him.
Roger, if you choose not to learn about the manifestations, that's on you. But you are ignorant in judging people who do.