If you will read the scriptures the believer spoke in tongues as the Spirit of God gave them the utterance, therefore this gift is of God. Acts 2:4And they were all filled with the Holy Ghost, and began to speak with other tongues, as the Spirit gave them utterance. They did not wait months or years to grow. That takes time. We need to power of the Spirit as we are growing. Some believed and spoke in unknown tongues by the Spirit of God immediately. The only requirement is to be born again, that is, repent and receive the Lord Jesus Christ and then He will give you the gift of the Holy Spirit. Acts 2:38Then Peter said unto them, Repent, and be baptized every one of you in the name of Jesus Christ for the remission of sins, and ye shall receive the gift of the Holy Ghost. 39For the promise is unto you, and to your children, and to all that are afar off, even as many as the LORD our God shall call Acts 10:43To him give all the prophets witness, that through his name whosoever believeth in him shall receive remission of sins. 44While Peter yet spake these words, the Holy Ghost fell on all them which heard the word. 45And they of the circumcision which believed were astonished, as many as came with Peter, because that on the Gentiles also was poured out the gift of the Holy Ghost. 46For they heard them speak with tongues, and magnify God. Then answered Peter, 47Can any man forbid water, that these should not be baptized, which have received the Holy Ghost as well as we? Acts 19:4Then said Paul, John verily baptized with the baptism of repentance, saying unto the people, that they should believe on him which should come after him, that is, on Christ Jesus. 5When they heard this, they were baptized in the name of the Lord Jesus. 6And when Paul had laid his hands upon them, the Holy Ghost came on them; and they spake with tongues, and prophesied. You speak of dangers. The dangerous thing is when a person attributed something as awesome and holy as a gift from God to some other spirit other than God. Also its very disrespectful to speak of God’s gift as ‘gibberish’ . Some may think so, but the whole miracle of it is that God gives the ability to speak in languages we don’t understand. The Bible itself says the human mind cannot understand it. God doesn’t cause confusion but many people themselves are confused about some issues until they have studied this out thoroughly, and many churches do not study it at all not do they want to. Now some may not agree or nor want some of the deeper things of the Spirit. He won’t force anything on us we don’t want. Although the gifts are a great benefit, a person doesn’t have to have anything to do with them if they don’t want to. But it would be wise to not speak against them. This is Bible and those who want the gifts and deeper things of the Spirit are told in 1 Cor 12 to learn about them and greatly desire the gifts.