I totally agree with you, we humans are the that created a division in religion even during the mortal life of Christ on earth He never segregated anyone or said this is a particular religion to be practiced. It was we humans that diversified everything the only thing Jesus preached about was the atonement of our sins by Christ and the believe in one God and the connection through Him. no matter whatever we call ourselves be it muslim,christians, or whatever as long as we don't practice religion according to the principle laid down we are not serving Christ. was stated in the Bible,never deprive yourself from the gathering of brethren so generally we not expected to be restricted to any particular church,temple or whatever we meant to seek and gather knowledge about Christ all around rather than restrict ourselves and segregate against other religions.

even if they involve God without going through the right process stipulated in the Bible is a sin, their her laid down rules to marriage so you not doing what's right and just believing you praying to God about means he approves of it. those rules were given for a specific purpose so you not going or doing things according to the stipulated principles it's a sin.