Salvation is simple. But there are many who will come to you in Jesus name deceiving many.
(Matthew 24:5 [KJV]) For many shall come in my name, saying, I am Christ; and shall deceive many.
False converts will claim that they are saved by water baptism. Water baptism doesnt save anyone. Just like circumcision of the flesh doesn't save anyone.
Then 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. — KJV, Acts 2:38
I have had dreadful experiences with people who claim that water baptism saves. Just dont enter their churches.
(Proverbs 12:10 [KJV]) A righteous man regardeth the life of his beast: but the tender mercies of the wicked are cruel.
An example of false salvation is that we are eternally saved by our works.
Speaking in tongues
People who speak in tongues are often not saved. They might be just led astray or decided to join a church or a movement. But speaking in tongues in not a sign of salvation. This gibberish.
What speaking in tongues really mean is that when at the day of pentacost they started to speak in other tongues that is when the scripture could be written in other languages than hebrew and greek.
Some will say that they want to be Jesus in your life. Watch out for these people. They are generally not saved and dangerous.
Cruel self promoters, con men who wants proselytes that they can rule like slaves and destroy if they dont work for them for free.