Romans 12 doesn't even mention tongues as a gift of importance. Church leaders were not required to have the gift of tongues. If we love others, if we love even our enemies, it is evidence that God's Spirit is guiding us. A good Christian example is a powerful witness to faith in Jesus Christ. Some people have taken these verses as a requirement, as if it were a commission that Christians ought to try to fulfill to prove their authenticity.
Some groups attempt to pick up poisonous snakes without being harmed.
The handlers usually avoid being bitten, but sometimes they are bitten and die. The success rate does not matter. What is important is whether God wants his people to be doing this. Faith does not come from seeing miracles. The Israelites who crossed the Red Sea saw numerous miracles, but they did not have the faith to obey God.