Where are you getting this from? The main instance of speaking in tongues (known human languages, not made up “angelic” languages) happened at Pentecost and again during the salvation of Cornelius’ house. That leaves dozens of instances in Acts alone if people getting saved without explicit mention of speaking in tongues.

Speaking in tongues was a rare miracle designed to rapidly spread the gospel in the early church and confirm the authenticity of the apostles as direct witnesses of Christ. No miracle or supernatural gift is required as evidence of having the Spirit. All believers get the Holy Spirit immediately upon salvation.